According to the "Gran Cronica de Alfonso XI", Uthman, unable to bring the Christians to battle, devised a stratagem in an attempt to force them to abandon the siege. A body of cavalry was sent to make a diversionary attack across the Guadalteba river, luring Alfonso out to fight while Usman circled round to attack the Christian camp and destroy the besieging army's supplies. Alfonso, however, having received intelligence of Uthman's preparations, kept most of his army back in camp while he sent a contingent to meet the demonstration on the river. It is as part of this force that some commentators assume Douglas and his company joined the battle. When Uthman arrived at the enemy camp he found Alonso's men armed and ready. He abandoned his attack and rode to support the diversionary force on the river where, unable to withstand the Castilian assault, his men were already starting to fall back.