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Lt. Col. Jan Kowalewski (23 October 1892 – 31 October 1965) was a Polish
cryptologist This is a list of cryptographers. Cryptography is the practice and study of techniques for secure communication in the presence of third parties called adversaries. Pre twentieth century * Al-Khalil ibn Ahmad al-Farahidi: wrote a (now lost) book ...
,
intelligence officer An intelligence officer is a member of the intelligence field employed by an organization to collect, compile or analyze information (known as intelligence) which is of use to that organization. The word of ''officer'' is a working title, not a r ...
,
engineer Engineers, as practitioners of engineering, are professionals who Invention, invent, design, build, maintain and test machines, complex systems, structures, gadgets and materials. They aim to fulfill functional objectives and requirements while ...
,
journalist A journalist is a person who gathers information in the form of text, audio or pictures, processes it into a newsworthy form and disseminates it to the public. This is called journalism. Roles Journalists can work in broadcast, print, advertis ...
, military commander, and creator and first head of the Polish Cipher Bureau. He recruited a large staff of
cryptologist This is a list of cryptographers. Cryptography is the practice and study of techniques for secure communication in the presence of third parties called adversaries. Pre twentieth century * Al-Khalil ibn Ahmad al-Farahidi: wrote a (now lost) book ...
s who broke
Soviet The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
military codes and ciphers during the Polish-Soviet War, enabling Poland to weather the war and achieve victory in the 1920 Battle of Warsaw.


Early life

Jan Kowalewski was born 1892 in
Łódź Łódź is a city in central Poland and a former industrial centre. It is the capital of Łódź Voivodeship, and is located south-west of Warsaw. Łódź has a population of 655,279, making it the country's List of cities and towns in Polan ...
,
Congress Poland Congress Poland or Congress Kingdom of Poland, formally known as the Kingdom of Poland, was a polity created in 1815 by the Congress of Vienna as a semi-autonomous Polish state, a successor to Napoleon's Duchy of Warsaw. It was established w ...
, under rule of the
Russian Empire The Russian Empire was an empire that spanned most of northern Eurasia from its establishment in November 1721 until the proclamation of the Russian Republic in September 1917. At its height in the late 19th century, it covered about , roughl ...
. After graduating from a local trade school, between 1909 and 1913 he studied at the
University of Liège The University of Liège (), or ULiège, is a major public university of the French Community of Belgium founded in 1817 and based in Liège, Wallonia, Belgium. Its official language is French (language), French. History The university was foun ...
in
Belgium Belgium, officially the Kingdom of Belgium, is a country in Northwestern Europe. Situated in a coastal lowland region known as the Low Countries, it is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeas ...
, where he graduated from the faculty of chemistry.


World War I

He returned to Poland in 1913, only to be mobilized for the Russian Army the following year, at the outbreak of
World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
. He fought in various formations on the Belarusian and Romanian fronts as an officer of the Engineering and Signal Corps, and in December 1918 he was allowed to join the Polish unit formed under command of Gen. Lucjan Żeligowski out of Poles living in Russia. As chief of intelligence of the Polish 4th Rifle Division he crossed the Romanian border with the Division and reached Poland in May 1919.


Polish-Soviet War

A
polyglot Multilingualism is the use of more than one language, either by an individual speaker or by a group of speakers. When the languages are just two, it is usually called bilingualism. It is believed that multilingual speakers outnumber monolin ...
and amateur
cryptologist This is a list of cryptographers. Cryptography is the practice and study of techniques for secure communication in the presence of third parties called adversaries. Pre twentieth century * Al-Khalil ibn Ahmad al-Farahidi: wrote a (now lost) book ...
, Kowalewski was initially attached to the staff of Gen.
Józef Haller Józef Haller (''de Hallenburg''; 13 August 1873 – 4 June 1960) was a Polish lieutenant general and legionary in the Polish Legions during the First World War. He was a harcmistrz (the highest Scouting instructor rank in Poland), the p ...
, fighting in
Volhynia Volhynia or Volynia ( ; see #Names and etymology, below) is a historic region in Central and Eastern Europe, between southeastern Poland, southwestern Belarus, and northwestern Ukraine. The borders of the region are not clearly defined, but in ...
and Eastern
Lesser Poland Lesser Poland, often known by its Polish name ''Małopolska'' (; ), is a historical region situated in southern and south-eastern Poland. Its capital and largest city is Kraków. Throughout centuries, Lesser Poland developed a separate cult ...
during the Polish-Ukrainian War for the city of
Lwów Lviv ( or ; ; ; see #Names and symbols, below for other names) is the largest city in western Ukraine, as well as the List of cities in Ukraine, fifth-largest city in Ukraine, with a population of It serves as the administrative centre of ...
. One day during his service there, Kowalewski was given some enciphered Bolshevik messages that had been intercepted, and within two days, he had deciphered them. They revealed the Bolsheviks' appreciation of General
Anton Denikin Anton Ivanovich Denikin (, ; – 7 August 1947) was a Russian military leader who served as the Supreme Ruler of Russia, acting supreme ruler of the Russian State and the commander-in-chief of the White movement–aligned armed forces of Sout ...
's White Russian forces. He also managed to break the codes and ciphers of the army of the
West Ukrainian People's Republic The West Ukrainian People's Republic (; West Ukrainian People's Republic#Name, see other names) was a short-lived state that controlled most of Eastern Galicia from November 1918 to July 1919. It included major cities of Lviv, Ternopil, Kolom ...
. He had to spend all night segregating radio intercepts and discarding the encrypted ones, it caused a major sensation among the staff. As a result, in July 1919 he was transferred to
Warsaw Warsaw, officially the Capital City of Warsaw, is the capital and List of cities and towns in Poland, largest city of Poland. The metropolis stands on the Vistula, River Vistula in east-central Poland. Its population is officially estimated at ...
, where he became chief of the Polish
General Staff A military staff or general staff (also referred to as army staff, navy staff, or air staff within the individual services) is a group of officers, Enlisted rank, enlisted, and civilian staff who serve the commanding officer, commander of a ...
's radio-intelligence department. By early September he had gathered a group of mathematicians from
Warsaw University The University of Warsaw (, ) is a public research university in Warsaw, Poland. Established on November 19, 1816, it is the largest institution of higher learning in the country, offering 37 different fields of study as well as 100 specializat ...
and
Lwów University The Ivan Franko National University of Lviv (named after Ivan Franko, ) is a state-sponsored university in Lviv, Ukraine. Since 1940 the university is named after Ukrainian poet Ivan Franko. The university is the oldest institution of highe ...
(most notably, founders of the Polish School of Mathematics
Stanisław Leśniewski Stanisław Leśniewski (; 30 March 1886 – 13 May 1939) was a Polish mathematician, philosopher and logician. A professor of mathematics at the University of Warsaw, he was a leading representative of the Lwów–Warsaw School of Logic and is k ...
,
Stefan Mazurkiewicz Stefan Mazurkiewicz (25 September 1888 – 19 June 1945) was a Polish mathematician who worked in mathematical analysis, topology, and probability. He was a student of Wacław Sierpiński and a member of the Polish Academy of Learning (''PAU''). ...
and
Wacław Sierpiński Wacław Franciszek Sierpiński (; 14 March 1882 – 21 October 1969) was a Polish mathematician. He was known for contributions to set theory (research on the axiom of choice and the continuum hypothesis), number theory, theory of functions ...
), who were also able to break Russian ciphers. Though Kowalewski's contribution to Polish victory in the Polish-Soviet War remained a secret for over 70 years, he was awarded Poland's highest military decoration, the Silver Cross of the ''
Virtuti Militari The War Order of Virtuti Militari (Latin: ''"For Military Virtue"'', ) is Poland's highest military decoration for heroism and courage in the face of the enemy at war. It was established in 1792 by the last King of Poland Stanislaus II of Poland, ...
''.


Interbellum

After the war ended, he was attached to the staff of the Third Silesian Uprising as the commander of intelligence services. In 1923 he was sent to
Tokyo Tokyo, officially the Tokyo Metropolis, is the capital of Japan, capital and List of cities in Japan, most populous city in Japan. With a population of over 14 million in the city proper in 2023, it is List of largest cities, one of the most ...
, where he organized a course in radio intelligence for Japanese officers. For his efforts in this area he was awarded the
Order of the Rising Sun The is a Japanese honors system, Japanese order, established in 1875 by Emperor Meiji. The Order was the first national decoration awarded by the Japanese government, created on 10 April 1875 by decree of the Council of State. The badge feat ...
- the highest military award in
Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...
. In 1928 he graduated from the
École Supérieure de Guerre École or Ecole may refer to: * an elementary school in the French educational stages normally followed by secondary education establishments (collège and lycée) * École (river), a tributary of the Seine flowing in région Île-de-France * Éco ...
in
Paris Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
and was promoted to the rank of major. Although not directly involved in radio intelligence any more, he remained a Polish intelligence officer. From 1929 he served as a military
attaché In diplomacy, an attaché () is a person who is assigned ("to be attached") to the diplomatic or administrative staff of a higher placed person or another service or agency. Although a loanword from French, in English the word is not modified ac ...
at the Polish embassy in
Moscow Moscow is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents with ...
, but in 1933 he was declared
persona non grata In diplomacy, a ' (PNG) is a foreign diplomat that is asked by the host country to be recalled to their home country. If the person is not recalled as requested, the host state may refuse to recognize the person concerned as a member of the diplo ...
and moved to a similar post in the embassy in
Bucharest Bucharest ( , ; ) is the capital and largest city of Romania. The metropolis stands on the River Dâmbovița (river), Dâmbovița in south-eastern Romania. Its population is officially estimated at 1.76 million residents within a greater Buc ...
, where he remained until 1937. Upon his return to Poland he briefly headed one of the branches of the Obóz Zjednoczenia Narodowego political organization and became the director of TISSA company, a Polish intelligence-sponsored company importing rare materials for the Polish arms industry. He was also promoted to lieutenant colonel.


World War II

After the outbreak of the Polish Defensive War of 1939 he was evacuated to
Romania Romania is a country located at the crossroads of Central Europe, Central, Eastern Europe, Eastern and Southeast Europe. It borders Ukraine to the north and east, Hungary to the west, Serbia to the southwest, Bulgaria to the south, Moldova to ...
, where he headed a committee of relief for Polish war refugees. In January 1940 he moved to France, where he joined the Polish Army in exile and became a proponent of an Allied offensive in the Balkans. However, the German spring offensive and the
fall of France The Battle of France (; 10 May – 25 June 1940), also known as the Western Campaign (), the French Campaign (, ) and the Fall of France, during the Second World War was the German invasion of the Low Countries (Belgium, Luxembourg and the Net ...
made the plan moot and Kowalewski had to flee German-occupied France. Through
Vichy France Vichy France (; 10 July 1940 – 9 August 1944), officially the French State ('), was a French rump state headed by Marshal Philippe Pétain during World War II, established as a result of the French capitulation after the Battle of France, ...
and
Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
he reached
Portugal Portugal, officially the Portuguese Republic, is a country on the Iberian Peninsula in Southwestern Europe. Featuring Cabo da Roca, the westernmost point in continental Europe, Portugal borders Spain to its north and east, with which it share ...
, where he formed yet another committee of relief for war refugees. Initially based at
Figueira da Foz Figueira da Foz (), officially Figueira da Foz City (), often called simply Figueira for short, is a city and a municipality in the Coimbra District, in Portugal. Practically at the midpoint of the Iberian Peninsula's Atlantic Ocean, Atlantic coa ...
, he soon moved to
Lisbon Lisbon ( ; ) is the capital and largest city of Portugal, with an estimated population of 567,131, as of 2023, within its administrative limits and 3,028,000 within the Lisbon Metropolitan Area, metropolis, as of 2025. Lisbon is mainlan ...
, then a center of espionage and battleground for spies of all countries involved in
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. There he made contact with his friend Jean Pangal ( Ioan Pangal), a Romanian centrist politician and former Romanian envoy to Lisbon. Though dismissed by the end of 1941 by Romanian leader
Ion Antonescu Ion Antonescu (; ; – 1 June 1946) was a Romanian military officer and Mareșal (Romania), marshal who presided over two successive Romania during World War II, wartime dictatorships as Prime Minister of Romania, Prime Minister and ''Conduc� ...
for his pro-Allied stance, Pangal remained in Lisbon and became a collaborator of Polish
intelligence Intelligence has been defined in many ways: the capacity for abstraction, logic, understanding, self-awareness, learning, emotional knowledge, reasoning, planning, creativity, critical thinking, and problem-solving. It can be described as t ...
in Allied attempts to win over the
Third Reich Nazi Germany, officially known as the German Reich and later the Greater German Reich, was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a totalitarian dictat ...
's allies -
Hungary Hungary is a landlocked country in Central Europe. Spanning much of the Pannonian Basin, Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the northeast, Romania to the east and southeast, Serbia to the south, Croatia and ...
,
Romania Romania is a country located at the crossroads of Central Europe, Central, Eastern Europe, Eastern and Southeast Europe. It borders Ukraine to the north and east, Hungary to the west, Serbia to the southwest, Bulgaria to the south, Moldova to ...
,
Finland Finland, officially the Republic of Finland, is a Nordic country in Northern Europe. It borders Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of Bothnia to the west and the Gulf of Finland to the south, ...
and
Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
.


Lisbon, 1941

The collaboration with Pangal proved vital to the Polish and Allied war effort, and Kowalewski managed to convince Gen.
Władysław Sikorski Władysław Eugeniusz Sikorski (; 20 May 18814 July 1943) was a Polish military and political leader. Before World War I, Sikorski established and participated in several underground organizations that promoted the cause of Polish independenc ...
and Minister Stanisław Kot to create a center of Polish intelligence in
Lisbon Lisbon ( ; ) is the capital and largest city of Portugal, with an estimated population of 567,131, as of 2023, within its administrative limits and 3,028,000 within the Lisbon Metropolitan Area, metropolis, as of 2025. Lisbon is mainlan ...
on January 15, 1941. Officially named the Center for Contact with the Continent (''Placówka Łączności z Kontynentem''), the Lisbon-based bureau was headed by Kowalewski and soon became the hub of an extensive net of Polish resistance, sabotage and intelligence organizations throughout occupied Europe. Acting independently of similar groups in Poland, which were run directly from London or Warsaw, the center coordinated the efforts of dozens of groups in France, Belgium, the Netherlands, Greece, Italy, North Africa, Spain and even Germany. It organized communication between the
Polish Government in Exile The Polish government-in-exile, officially known as the Government of the Republic of Poland in exile (), was the government in exile A government-in-exile (GiE) is a political group that claims to be the legitimate government of a sovere ...
and occupied Europe, as well as providing logistical and financial support for Polish resistance groups throughout Western Europe. Kowalewski's intelligence network was also helpful to the British government, as most of his reports were passed either to SOE or to the Ministry of Economic Warfare. A notable coup for his Lisbon center was the passing of the exact date for
Operation Barbarossa Operation Barbarossa was the invasion of the Soviet Union by Nazi Germany and several of its European Axis allies starting on Sunday, 22 June 1941, during World War II. More than 3.8 million Axis troops invaded the western Soviet Union along ...
to the British, who were thus informed of the fact at least two weeks prior to the actual invasion of Russia. Kowalewski also managed to neutralize a secret radio station used by the Germans to communicate with
U-boat U-boats are Submarine#Military, naval submarines operated by Germany, including during the World War I, First and Second World Wars. The term is an Anglicization#Loanwords, anglicized form of the German word , a shortening of (), though the G ...
s operating in the
Atlantic The Atlantic Ocean is the second largest of the world's five oceanic divisions, with an area of about . It covers approximately 17% of Earth's surface and about 24% of its water surface area. During the Age of Discovery, it was known for se ...
. He was also crucial in enabling former Romanian King
Carol II Carol II (4 April 1953) was King of Romania from 8 June 1930, until his forced abdication on 6 September 1940. As the eldest son of Ferdinand I of Romania, King Ferdinand I, he became crown prince upon the death of his grand-uncle, King Carol I, ...
to escape from Romania, and leave
Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
for Lisbon.


Postwar

Despite Kowalewski having contacts with numerous politicians of Hungary, Romania and Italy willing to change sides, the situation changed after the Casablanca Conference of 1943, when the Allies demanded the
unconditional surrender An unconditional surrender is a surrender in which no guarantees, reassurances, or promises (i.e., conditions) are given to the surrendering party. It is often demanded with the threat of complete destruction, extermination or annihilation. Anno ...
of the Axis. The situation further deteriorated after the
Tehran Conference The Tehran Conference (codenamed Eureka) was a strategy meeting of the Allies of World War II, held between Joseph Stalin, Franklin D. Roosevelt, and Winston Churchill from 28 November to 1 December 1943. It was the first of the Allied World Wa ...
, when it became clear that Hungary and Romania would fall under Soviet domination anyway and that the plan for a second front in the
Balkans The Balkans ( , ), corresponding partially with the Balkan Peninsula, is a geographical area in southeastern Europe with various geographical and historical definitions. The region takes its name from the Balkan Mountains that stretch throug ...
, which would allow the Hungarians and Romanians to break with Nazi Germany was finally dismissed. According to recent research by a Polish-British joint history commission for investigation of Polish World War II intelligence service, at the latter conference the Soviets demanded that Kowalewski be withdrawn from his post to England.See Western betrayal In late January 1944 Frank Roberts, head of the Central Department of the British
Foreign Office Foreign may refer to: Government * Foreign policy, how a country interacts with other countries * Ministry of Foreign Affairs, in many countries ** Foreign Office, a department of the UK government ** Foreign office and foreign minister * United ...
, informed Gen. Colin Gubbins, head of the SOE, that Kowalewski's network was not only aimed at the Germans, but at creating a common ''Polish-Hungarian-Romanian Bloc'', which was allegedly aimed at vital Soviet interests. On 6 March 1944 Sir Alexander Cadogan of the Foreign Office informed the Polish minister of foreign affairs Edward Raczyński that Kowalewski's contacts with the ''opposing powers'' could be treated as treachery and that he should be dismissed. Although no proofs were presented, the Polish government felt forced to obey the British wish and Kowalewski was dismissed from his post on 20 March and on 5 April he was transported to London. Kowalewski was named the chief of the Polish Operations Bureau at the Special Forces Headquarters. Among his tasks was the preparation of the Polish resistance organizations in occupied Europe for
Operation Overlord Operation Overlord was the codename for the Battle of Normandy, the Allies of World War II, Allied operation that launched the successful liberation of German-occupied Western Front (World War II), Western Europe during World War II. The ope ...
. However, his post was mostly titular as it was already too late for any arrangements to have effect and Kowalewski could change nothing.


British exile

After the war Kowalewski remained in exile in Great Britain, where he started working as a journalist. Until 1955 he was the editor in chief of an '' East Europe and Soviet Russia'' monthly. In 1958 and 1959 he was also a tutor at an unofficial military school for the Polish diaspora. He also briefly collaborated with
Radio Free Europe Radio Free Europe/Radio Liberty (RFE/RL) is a media organization broadcasting news and analyses in 27 languages to 23 countries across Eastern Europe, Central Asia, the Caucasus, and the Middle East. Headquartered in Prague since 1995, RFE/RL ...
and other Polish exile organizations. In his late years, in 1963, he briefly returned to cryptanalysis and managed to break the codes used by
Romuald Traugutt Romuald Traugutt (16 January 1826 – 5 August 1864) was a Polish military officer and politician who served as the last dictator of the January Uprising. Following a career in the Imperial Russian Army that included service in Hungary and Crim ...
during the
January Uprising The January Uprising was an insurrection principally in Russia's Kingdom of Poland that was aimed at putting an end to Russian occupation of part of Poland and regaining independence. It began on 22 January 1863 and continued until the last i ...
. He died of cancer on 31 October 1965 in
London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
.


See also

*
History of Polish Intelligence Services History is the systematic study of the past, focusing primarily on the human past. As an academic discipline, it analyses and interprets evidence to construct narratives about what happened and explain why it happened. Some theorists categ ...
*
List of Poles This is a partial list of notable Polish people, Polish or Polish language, Polish-speaking or -writing people. People of partial Polish heritage have their respective ancestries credited. Physics *Miedziak Antal * Czesław Białobrzesk ...
* Western betrayal


Notes


References

*Jan Stanisław Ciechanowski, The Principal Achievements of Polish Intelligence (Part VI). Lt-Col. Jan Kowalewski’s Mission in Portugal, Vol. I: The Report of the Anglo-Polish Historical Committee, eds. T. Stirling, D. Nałęcz, T. Dubicki, co-ordinator of the English Language version of the Polish papers J. Ciechanowski, Vallentine Mitchell, London-Portland 2005, pp. 518–531. * Richard Woytak, "Colonel Kowalewski and the Origins of Polish Code Breaking and Communication Interception," ''East European Quarterly'', vol. XXI, no. 4 (January 1988), pp. 497–500. * * * "Crusader In The Secret War", Judith Hare, Countess of Listowel, 1952, Christopher Johnson {{DEFAULTSORT:Kowalewski, Jan 1892 births 1965 deaths Military personnel from Łódź Recipients of the Silver Cross of the Virtuti Militari Recipients of the Order of the Rising Sun Polish Army officers Polish intelligence officers Polish spies University of Liège alumni 20th-century cryptographers Polish cryptographers Cipher Bureau (Poland) Polish anti-communists World War II spies for Poland Polish military attachés