[1] In 1190, the Almohad Caliph, Yaqub al-Mansur, returned to Seville after a failed campaign against Silves.

[2] The Caliph made preparations to resume his campaign, recruited many, and gathered many siege weapons.

[3][4] The Caliph decided to resume his campaign against Portugal and on 28 April 1191, he left Seville and crossed the Guadiana River.

[5][6][7] The Caliph's first target was Alcácer do Sal, located east-south of Lisbon and close to Sado River.

The attack peaked, and when things worsened, the Portuguese garrison quickly called to surrender.