Frederik-Valdemar Olsen (24 May 1877 – 19 November 1962) was a Danish soldier who became a general and commander in chief of the Belgian Congo ''
Force Publique
The ''Force Publique'' (, "Public Force"; ) was the military of the Congo Free State and the Belgian Congo from 1885 to 1960. It was established after Belgian Army officers travelled to the Free State to found an armed force in the colony on L ...
''.
He was born into a poor family, joined the Danish army, then in 1898 volunteered to serve in the
Congo Free State
The Congo Free State, also known as the Independent State of the Congo (), was a large Sovereign state, state and absolute monarchy in Central Africa from 1885 to 1908. It was privately owned by Leopold II of Belgium, King Leopold II, the const ...
.
He rose quickly through the ranks, and in 1909–1910 played an important role in a stand-off with German and British forces disputing the eastern border of what was now the
Belgian Congo
The Belgian Congo (, ; ) was a Belgian colonial empire, Belgian colony in Central Africa from 1908 until independence in 1960 and became the Republic of the Congo (Léopoldville). The former colony adopted its present name, the Democratic Repu ...
.
During
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 ...
Olsen commanded a force that defended
Northern Rhodesia
Northern Rhodesia was a British protectorate in Southern Africa, now the independent country of Zambia. It was formed in 1911 by Amalgamation (politics), amalgamating the two earlier protectorates of Barotziland-North-Western Rhodesia and North ...
against a German attack, then advanced from the south of
Lake Kivu
Lake Kivu is one of the African Great Lakes. It lies on the border between the Democratic Republic of the Congo and Rwanda, and is in the Albertine Rift, the western branch of the East African Rift. Lake Kivu empties into the Ruzizi River, which ...
to take
Tabora
Tabora is the capital of Tanzania's Tabora Region and is classified as a municipality by the Tanzanian government. It is also the administrative seat of Tabora Urban District. According to the 2012 census, the district had a population of 226, ...
in what is now Tanzania.
After the war he became commander of the ''Force Publique'' before retiring as a general in 1925.
Olsen was then made general manager of the state-owned Congo River shipping line
Unatra, later combined with railway lines to form
Otraco.
He retired from this position in 1947.
Early years (1877–1898)
Frederik-Valdemar Olsen was born on 24 May 1877 in
Kalundborg
Kalundborg () is a Danish city with a population of 16,659 (1 January 2025),[Zealand
Zealand ( ) is the largest and most populous islands of Denmark, island in Denmark proper (thus excluding Greenland and Disko Island, which are larger in size) at 7,031 km2 (2715 sq. mi.). Zealand had a population of 2,319,705 on 1 Januar ...](_blank)
, while his mother did odd jobs and ran a bakery.
He attended the ''Realskölle'' in Kalundborg.
He graduated in 1893.
Olsen found a job at the city police station.
On 12 October 1896 he entered the army for his compulsory military service.
His ability was noted by his superiors, and the mayor of Kalundborg paid for him to study at the Military Academy in Copenhagen.
On 8 October 1897 Olsen became a 2nd lieutenant.
He was assigned to the 1st Artillery Regiment, where he served in a battery commanded by
Johan Stöckel, who had worked on construction of the
Fort de Shinkakasa.
Stöckel's stories made him keen to serve in Africa, and he was engaged by
Hans-Hugold von Schwerin for service in the
Congo Free State
The Congo Free State, also known as the Independent State of the Congo (), was a large Sovereign state, state and absolute monarchy in Central Africa from 1885 to 1908. It was privately owned by Leopold II of Belgium, King Leopold II, the const ...
.
He was a second lieutenant in ''Force Publique''.
Force Publique
Pre-War (1898–1914)

Olsen sailed from Antwerp to
Boma in December 1898, and was assigned to the
Irebu camp under commander
Luc-Arthur-Joseph Jeuniaux.
He was sent to
Orientale Province
Orientale Province () is one of the former provinces of the Democratic Republic of the Congo and its predecessors the Congo Free State and the Belgian Congo. It went through a series of boundary changes between 1898 and 2015, when it was divided ...
on 11 October 1899.
On 7 December 1899 he joined the troops that were repressing the revolt that had begun in 1896 in the northeast of the Congo during the Congo-Nile expedition of
Francis Dhanis.
There were constant incidents in the region with Germans who had occupied some of the Belgian territory during the revolt and were reluctant to return it to the Belgians.
Commander
Paul Costermans
Paul may refer to:
People
* Paul (given name), a given name, including a list of people
* Paul (surname), a list of people
* Paul the Apostle, an apostle who wrote many of the books of the New Testament
* Ray Hildebrand, half of the singing duo ...
sent Olsen to found a post in July 1900 on
Lake Kivu
Lake Kivu is one of the African Great Lakes. It lies on the border between the Democratic Republic of the Congo and Rwanda, and is in the Albertine Rift, the western branch of the East African Rift. Lake Kivu empties into the Ruzizi River, which ...
, which later became
Bukavu
Bukavu is a city in eastern Democratic Republic of the Congo (DRC), lying at the extreme south-western edge of Lake Kivu, west of Cyangugu in Rwanda, and separated from it by the outlet of the Ruzizi River. It is the capital of the South Kivu P ...
.
Lieutenant
Paul Léon Delwart, head of the elite company of the ''Force Publique'' in
Orientale Province
Orientale Province () is one of the former provinces of the Democratic Republic of the Congo and its predecessors the Congo Free State and the Belgian Congo. It went through a series of boundary changes between 1898 and 2015, when it was divided ...
, died on 19 August 1900.
Olsen replaced Delwart as leader of the elite Belgian company in the
Ruzizi
The Ruzizi (also sometimes spelled Rusizi, French: ''Rivière Ruzizi''; Dutch: ''Ruzizi Rivier'') is a river, long, that flows from Lake Kivu to Lake Tanganyika in Central Africa, descending from about to about above sea level over its lengt ...
-
Kivu
Kivu is the name for a large region in the eastern Democratic Republic of the Congo that borders Lake Kivu. It was a ''Région'' (read 'province') of the country under the rule of Mobutu Sese Seko from 1966 to 1988. As an official ''Région'' ...
region, based in
Uvira
Uvira is a city strategically located in the South Kivu Province of the eastern region of the Democratic Republic of the Congo. Covering approximately 16 square kilometers and with an estimated population of 726,000 as of 2024, it borders Baful ...
.
Olsen completed his first 3-year term and returned to Antwerp on 11 December 1901.
His health had been damaged, and he took a 9-month leave of absence.
Olsen was promoted to captain, and left Antwerp on 2 October 1902 for Boma.
He went on to
Stanleyville, where
Justin Malfeyt gave him command of the mobile column that was to travel to
Uvira
Uvira is a city strategically located in the South Kivu Province of the eastern region of the Democratic Republic of the Congo. Covering approximately 16 square kilometers and with an estimated population of 726,000 as of 2024, it borders Baful ...
.
Due to a severe attack of
malaria
Malaria is a Mosquito-borne disease, mosquito-borne infectious disease that affects vertebrates and ''Anopheles'' mosquitoes. Human malaria causes Signs and symptoms, symptoms that typically include fever, Fatigue (medical), fatigue, vomitin ...
he temporarily handed over common of the column, but reached Uvira on 7 March 1903.
He next came down with
hematuria
Hematuria or haematuria is defined as the presence of blood or red blood cells in the urine. "Gross hematuria" occurs when urine appears red, brown, or tea-colored due to the presence of blood. Hematuria may also be subtle and only detectable with ...
, and had to return to Europe, reaching Antwerp on 21 March 1904.
He left Antwerp again on 6 October 1904 and returned to the Ruzizi-Kivu territory.
On 9 December 1905 he was appointed captain-commander, and on 23 March 1906 was placed in command of the Uvira zone.
On 12 February 1907 he was promoted to command of the Ruzizi-Kivu territories.
He organized the border defenses, pacified the region and created a disciplined body of troops.
He went on leave in Europe from 24 November 1907 to 23 July 1908.
During his fourth term Olsen had to deal with a complicated situation due to unauthorized agreements between local Belgian and German officers, and agreements between the Germans and the British.
It had been agreed that the
Mufumbiro Mountains were British, but instead the Germans had ceded the plain of Ufumbiro near
Rutshuru
Rutshuru is a town located in the North Kivu province of the eastern Democratic Republic of the Congo, and is headquarters of an administrative district, the Rutshuru Territory. The town lies in the western branch of the Albertine Rift between L ...
to the British despite its clearly being in Belgian territory.
The
Kivu frontier incident began when the British district commissioner
John Methuen Coote
John Methuen Coote (13 March 1878 – 4 October 1967) was a British colonial administrator who served in the East Africa Protectorate.
He is known for a stand-off with the Belgians over the location of the border between the Belgian Congo and the B ...
notified the Belgians on 26 June 1909 that he was taking possession.
Olsen travelled there from the
Lake Albert region, arrested two British soldiers camped at Kurezi, and created three redoubts that blocked all access by the British.
Coote decided to repossess Kurezi but was stopped in a marshy region and ran low of food.
Olsen refused to meet Coote until he withdrew, which Coote would not do, and a stalemate ensued for ten months while the Belgian, German and British governments agreed on their respective borders in the region.
At the same time Olsen had to deal with various provocations by the Germans in the volcano region to the north of
Lake Kivu
Lake Kivu is one of the African Great Lakes. It lies on the border between the Democratic Republic of the Congo and Rwanda, and is in the Albertine Rift, the western branch of the East African Rift. Lake Kivu empties into the Ruzizi River, which ...
.
After the Kivu border question had been settled in May 1910, Olsen was charged with creating a military force in
Katanga to protect the rich mining region from attempts by South African
Boer
Boers ( ; ; ) are the descendants of the proto Afrikaans-speaking Free Burghers of the eastern Cape frontier in Southern Africa during the 17th, 18th, and 19th centuries. From 1652 to 1795, the Dutch East India Company controlled the Dutch ...
trekkers to settle it.
Olsen worked from the end of July to the end of October to transport a force to Katanga consisting of 26 Europeans, 1,000 Congolese, 26 machine guns, 20 cannons, with their food, equipment and ammunition.
The only transport was the small steamer ''Delcommune'' on
Lake Tanganyika
Lake Tanganyika ( ; ) is an African Great Lakes, African Great Lake. It is the world's List of lakes by volume, second-largest freshwater lake by volume and the List of lakes by depth, second deepest, in both cases after Lake Baikal in Siberia. ...
.
He organized a well trained force in Katanga, and pioneered the use of bicycles by the ''
Force Publique
The ''Force Publique'' (, "Public Force"; ) was the military of the Congo Free State and the Belgian Congo from 1885 to 1960. It was established after Belgian Army officers travelled to the Free State to found an armed force in the colony on L ...
''.
He was promoted to major on 20 November 1911.
World War I (1914–1918)
With the outbreak of World War I, Olsen had to mobilize Katanga in August 1914.
On 11 September 1914 he received a call for help from George Graham Percy Lyons, district commissioner of
Abercorn
Abercorn ( Gaelic: ''Obar Chùirnidh'', Old English: ''Æbbercurnig'') is a village and civil parish in West Lothian, Scotland. Close to the south coast of the Firth of Forth, the village is around west of South Queensferry. The parish had a ...
in
Northern Rhodesia
Northern Rhodesia was a British protectorate in Southern Africa, now the independent country of Zambia. It was formed in 1911 by Amalgamation (politics), amalgamating the two earlier protectorates of Barotziland-North-Western Rhodesia and North ...
, who was being attacked by the Germans.
Olsen took action since he considered the move would help protect Katanga, and his cycling battalions soon arrived in Rhodesia, where they remained until relieved by British reinforcements.
During this period Olsen had to be hospitalized for
dysentery
Dysentery ( , ), historically known as the bloody flux, is a type of gastroenteritis that results in bloody diarrhea. Other symptoms may include fever, abdominal pain, and a feeling of incomplete defecation. Complications may include dehyd ...
.
On 23 June 1915 General
Charles Tombeur
Lieutenant General Charles Tombeur, 1st Baron of Tabora (4 May 1867 – 2 December 1947) was a Belgian military officer and colonial civil servant. As well as holding several major administrative positions in the Belgian Congo, he is particularl ...
ordered that the remaining troops in Rhodesia prepare to leave for Kivu.
On 1 August 1915 the troops had started their movement when the Germans attacked
Saisi, from Abercorn.
Olsen decided to send a battalion under
Gaston Heenen to defend Saisi.
The troops did not resume their move to the north until 3 November 1915.
Olsen again fell sick and had to remain in
Elizabethville until 3 March 1916.

Olsen was made lieutenant colonel of 23 January 1916 and was placed in command of the southern brigade for the
Tabora Offensive.
He joined the southern brigade in
Shangugu on 23 April 1916.
The northern brigade under
Philippe Molitor attacked the Germans to the north of Lake Kivu, took
Kigali
Kigali () is the Capital (political), capital and largest city of Rwanda. It is near the nation's geographic centre in a region of rolling hills, with a series of valleys and ridges joined by steep slopes. As a primate city, Kigali is a relativ ...
, but lost momentum in the march towards
Mwanza
Mwanza City, also known as Rock City to the residents, is a port city and capital of Mwanza Region on the southern shore of Lake Victoria in north-western Tanzania. With an urban population of 1,104,521 and a population of 3,699,872 in the region ...
on
Lake Victoria
Lake Victoria is one of the African Great Lakes. With a surface area of approximately , Lake Victoria is Africa's largest lake by area, the world's largest tropics, tropical lake, and the world's second-largest fresh water lake by surface are ...
due to heavy rains.
The southern brigade under Olsen attacked between Lake Kivu and Lake Tanganyika, where
Georges Moulaert
Georges Brunon Joseph Marie Moulaert (19 May 1875 – 17 September 1958) was a Belgian colonial administrator. He was deputy governor general of Équateur Province in the Belgian Congo from 1917 to 1919. Later he became a businessman, head of seve ...
was in command of the naval forces.
Olsen quickly took Shangugu and
Kitega, then returned towards Lake Tanganyika and took
Usumbura
Bujumbura (; ), formerly Usumbura, is the economic capital, largest city and main port of Burundi. It ships most of the country's chief export, coffee, as well as cotton and tin ore. Bujumbura was formerly the country's political capital. In la ...
.
Continuing south he took
Kigoma
Kigoma is a city and lake port in Kigoma-Ujiji District in Tanzania, on the northeastern shores of Lake Tanganyika and close to the border with Burundi and The Democratic Republic of the Congo. It serves as the capital for the surrounding Kigoma ...
on 28 July 1916 with little opposition, since its defenses were facing the lake, which Moulaert now dominated.
On 2 August 1916 Olsen took
Ujiji
Ujiji is the oldest town in western Tanzania and is located in Kigoma-Ujiji District of Kigoma Region. Originally a Swahili settlement and then an Arab slave trading post by the mid-nineteenth century nominally under the Sultanate of Zanziba ...
.
In August the northern brigade occupied Maria-Hilf, then Ugaga, then Saint-Michael.
The Germans retreated towards
Tabora
Tabora is the capital of Tanzania's Tabora Region and is classified as a municipality by the Tanzanian government. It is also the administrative seat of Tabora Urban District. According to the 2012 census, the district had a population of 226, ...
, destroying the railway behind them.
Moulaert sent railway equipment by barge from
Albertville
Albertville (; Franco-Provençal, Arpitan: ''Arbèrtvile'') is a Subprefectures in France, subprefecture of the Savoie Departments of France, department in the Auvergne-Rhône-Alpes Regions of France, region in Southeastern France.
It is best k ...
, which Olsen used to repair the railway as he advanced.
Olsen's brigade, advancing from Kigoma, was halted at the
Malagarasi River.
Around 15 August it gained a foothold on the opposite bank.
Usoke station on the railway line was taken from the Germans on 30 August.
The Germans made violent efforts from 2 to 6 September to retake it, but did not succeed.
By the start of September the two brigades were converging on Tabora
From September 10 to 12 Olsen's brigade took and defended
Lulanguru, to the west of Tabora, while the northern brigade found Germans strongly entrenched in the
Itaga hills.
The two brigades joined on 16 September along an arc to the northwest of Tabora.
Tombeur was to lead the final attack, but on the night of 18-19 September the Germans evacuated the city.
Olsen continued pursuit of the Germans until ordered to halt.
He gained a large part of the credit for the successful operations.
Post-war (1918–1925)
Olsen took leave in France, then returned to East Africa via the
Suez Canal
The Suez Canal (; , ') is an artificial sea-level waterway in Egypt, Indo-Mediterranean, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia (and by extension, the Sinai Peninsula from the rest ...
and
Dar es Salaam
Dar es Salaam (, ; from ) is the largest city and financial hub of Tanzania. It is also the capital of the Dar es Salaam Region. With a population of over 7 million people, Dar es Salaam is the largest city in East Africa by population and the ...
.
When the armistice ended the war in November 1918 Olsen resumed his command of the troops in Katanga.
In 1920 the Chamber and the Senate unanimously voted to make him a fully naturalized Belgian citizen (''grande naturalisation belge'').
The citation stated that "this brave man among all the brave men, who has spent 30 years in the Congo, has now become a great man of Belgium in heart and soul".
On 22 November 1920 Olsen was appointed colonel and became commander in chief of the ''Force Publique'', which he reorganized for peacetime duties.
In September 1924 Olsen was made governor of
Congo-Kasaï
Congo-Kasaï was one of the four large provinces of the Belgian Congo defined in 1914. It was formally established in 1919, and in 1933 was divided into the new provinces of Léopoldville Province, Léopoldville and Lusambo Province, Lusambo.
Lo ...
, based in
Léopoldville
Kinshasa (; ; ), formerly named Léopoldville from 1881–1966 (), is the capital and largest city of the Democratic Republic of the Congo. Kinshasa is one of the world's fastest-growing megacities, with an estimated population of 17 million ...
.
He was promoted to general on 17 April 1925 and took retirement on 25 April 1925.
Later career (1925–1962)
The
Minister of the Colonies,
Henri Carton de Tournai, had asked Olsen to retire so he could take over management of the state-owned transportation company
Unatra (Union National des Transports Fluviaux).
Olsen took a vacation in Europe from 11 June to 8 December 1925.
He then took office as general manager of Unatra, which had been formed by combining the shipyrards and boats of
Sonatra (Sociéte National des Transports Fluviaux au Congo) and
Citas (Compagnie Industrielle et de Transports au Stanley Pool).
He undertook various reforms to stop corruption, ensure schedules were met and improve financial management.
He structured the organization into sectors based on Coquilhatville, Bumba, Bandundu and Port-Francqui.
He had to struggle with local bureaucracy, and at one pointed offered his resignation to the ministry, which was refused.
The C.F.L. (
Compagnie du chemin de fer du Congo supérieur aux Grands Lacs africains) was impressed by Olsen's achievements and made him their general manager in Africa, in charge of transport on the
Lualaba River
The Lualaba River (, , ) flows entirely within the eastern part of Democratic Republic of the Congo. It provides the greatest streamflow to the Congo River, while the River source, source of the Congo is recognized as the Chambeshi River, Chambeshi ...
.
In 1930 Olsen contracted
sleeping sickness
African trypanosomiasis is an insect-borne parasitic infection of humans and other animals.
Human African trypanosomiasis (HAT), also known as African sleeping sickness or simply sleeping sickness, is caused by the species '' Trypanosoma b ...
and had to leave Africa.
Olsen remained a director of Unatra and C.F.L., and in 1936 was made managing director of
Otraco (Office des transports coloniaux), formed by combining Unatra, the
Matadi-Léopoldville Railway and the
Mayumbe Railway.
He visited the Congo between 5 November 1937 and 21 June 1938 to integrate the railway and shipping company into a coherent whole, reconciling the private enterprise culture of the railway with the civil service culture of the shipping line.
During
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 ...
(1939–1945) Olsen remained in Belgium as head of Otraco during the German occupation.
After the war he launched a major expansion of the fleet.
He retired in May 1947.
That year the largest and most modern passenger ship on the Congo was named after Olsen.
Olsen married Harriet Meta de Stricker in Copenhagen on 17 September 1906.
This marriage was dissolved.
He married again on 25 July 1929 in Paris to Yvonne Marguerite Madeleine Atgier (2 February 1888 – 5 February 1962), a Frenchwoman who had been born in Algiers.
Olsen died in
Etterbeek
Etterbeek (; ) is one of the List of municipalities of the Brussels-Capital Region, 19 municipalities of the Brussels-Capital Region, Belgium. Located in the eastern part of the region, it is bordered by the municipalities of Auderghem, the Cit ...
, Belgium on 17 November 1962.
He held the Grand Cross of the
Order of the African Star
The Order of the African Star (; ) was established by Leopold II of Belgium on 30 December 1888, in his capacity as ruler of the Congo Free State, and was awarded for services to Congo and for the "promotion of African civilisation in general". I ...
, Commander of the
Order of Leopold, the
Royal Order of the Lion
Royal may refer to:
People
* Royal (name), a list of people with either the surname or given name
* A member of a royal family or royalty
Places United States
* Royal, Arkansas, an unincorporated community
* Royal, Illinois, a village
* Ro ...
, the
Order of the Crown and the
Order of the Dannebrog
The Order of the Dannebrog () is a Denmark, Danish order of chivalry instituted in 1671 by Christian V of Denmark, Christian V. Until 1808, membership in the Order was limited to fifty members of noble or royal rank, who formed a single cla ...
.
There was an Avenue Général Olsen in several cities.
In 1953 a monument was erected in Bukavu for the force led by Olsen that had taken possession of the place for the Congo Free State.
Publications
*
*
*
*
Notes
Sources
*
*
*
*
{{DEFAULTSORT:
1877 births
1962 deaths
Belgian military personnel of World War I
Officers of the Force Publique
Belgian Congo officials
Danish generals
Belgian generals
Colonial governors of Ruanda-Urundi