The siege of Oran of 1556 occurred when Ottoman troops from

Algiers Algiers is the capital city of Algeria as well as the capital of the Algiers Province; it extends over many Communes of Algeria, communes without having its own separate governing body. With 2,988,145 residents in 2008Census 14 April 2008: Offi ...

besieged the Spanish garrison in

Oran Oran () is a major coastal city located in the northwest of Algeria. It is considered the second most important city of Algeria, after the capital, Algiers, because of its population and commercial, industrial and cultural importance. It is w ...

. The siege, by land and sea, was ultimately lifted without success. Although Algerian forces were able to win a couple of skirmishes against the Spanish army,La Domination Espagnole à Oran, pp. 139- 143. it had to be lifted in August 1556 when the Ottoman fleet of 40 galleys was recalled for duty in the Eastern Mediterranean.''A history of the Maghrib in the Islamic period'' by Jamil M. Abun-Nasr p.157''ff''
/ref> During the time the Ottomans were occupied in the siege, the Moroccans, who were allied with the Spanish, occupied the city of

Tlemcen Tlemcen (; ) is the second-largest city in northwestern Algeria after Oran and is the capital of Tlemcen Province. The city has developed leather, carpet, and textile industries, which it exports through the port of Rachgoun. It had a population of ...

but Algerian forces were able to reconquer it the following year during the Campaign of Tlemcen, led by Hassan Pacha and Aït Abbas contingents from Kabylia.

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