Siege of Silves
1190 CE.
Shown on the map at 37.187°, -8.439°.
The Almohad Caliphate launched a major offensive against the Kingdom of Portugal in the spring of 1190 that lasted into the summer of 1191. The Caliph Yaʿqūb al-Manṣūr crossed over from Africa to take personal command of his forces. The campaign of 1190 was underwhelming because of assistance Portugal received from passing armies of the Third Crusade. The sieges of Tomar, Santarém and Silves had to be abandoned, but the caliph overwintered in Seville. The campaign of 1191 reversed Portugal's recent reconquests, captured Silves after a second siege and pushed the frontier north to the Tagus.
Text from the Wikipedia article Almohad campaign against Portugal (1190–1191), licensed CC BY-SA 4.0.