After his defeat at the Battle of Teba in 1330, Mohamed IV of Granada sent to Abu Hasan for help in maintaining his survival. Hasan sent a fleet and an army that landed at Algeciras in 1333. These set about helping the Granadan King to capture the Castilian outpost of Gibraltar, which he did after less than two months. They then conducted a limited campaign to reunite these territories to the realm of Granada. Back in Morocco, Abu Hasan amassed his biggest army to undertake an invasion of Castile with the intention of undoing the previous century's Christian advances.