After the Battle of Getares on April 8th, 1340, where the Castilian fleet suffered a setback, the Christian forces, supported by the Kingdom of Portugal and the Republic of Genoa, rearmed and prepared for a decisive engagement.

The Castilian and Portuguese fleets sought to regain control of the Strait and support the ongoing siege of Algeciras.

[1] On April 8th, 1342, the combined Castilian and Portuguese fleet confronted the Marinid forces in Guadalmesí.

The Christian forces, having received reinforcements and naval support, achieved a decisive victory over the Marinid fleet.

[1] The victory at Guadalmesí allowed Alfonso XI of Castile to proceed with the siege of Algeciras, which eventually led to the city's capture.