The conquest of Oran by the
Hispanic Monarchy took place on May 1509, when an army led by
Pedro Navarro on behalf of the
Cardinal Cisneros seized the north-African city, which was controlled by the moors of Tlemcen.
A fleet left port from
Cartagena on 16 May and sailed towards
Mers el-Kebir, a city located near
Oran and already (since 1505) under Spanish control. The fleet had 80 naos and 10 galleys, plus additional small boats. They carried around 8000-12,000 infantry-men and 3000-4000 cavalry-men. The army spent the night of 17 May in Mers el Kebir. The Christians stormed the city of Oran, then part of the
Kingdom of Tlemcen, combining the use of the fleet with a ground assault on 18 May. After breaking through the walls of the city the casualties numbered less than 30 on the assaulting side, while the 12,000 defenders suffered 4,000 casualties.
On 20 May, Cisneros entered the city, already conquered.
The city remained a part of the Spanish Empire until 1708, when it was seized by the Ottoman
Dey of Algiers taking advantage of the
War of the Spanish Succession. In 1732 the city was conquered again by the Spanish in 1732. After the 1790 earthquake, they abandoned Oran and Mers el-Kebir in 1792.