Bonaparte had been informed that Murad Bey had evaded the pursuit by Generals Desaix, Belliard, Donzelot and Davout and was descending on Upper Egypt. Bonaparte thus marched to attack him at Giza, also learning that 100 Ottoman ships were off Aboukir, threatening Alexandria. Without losing time or returning to Cairo, Bonaparte ordered his generals to make all speed to meet the army commanded by the pasha of Rumelia, Saïd-Mustapha, which had joined up with the forces under Murad Bey and Ibrahim. First Bonaparte advanced to Alexandria, from which he marched to Aboukir, whose fort was now strongly garrisoned by the Ottomans. Bonaparte deployed his army so that Mustapha would have to win or die with all his family. Mustapha's army was 18,000 strong and supported by several cannons, with trenches defending it on the landward side and free communication with the Ottoman fleet on the seaward side. Bonaparte ordered an attack on 25 July and the Battle of Abukir ensued. In a few hours the trenches were taken, 10,000 Ottomans drowned in the sea and the rest captured or killed. Most of the credit for the French victory that day goes to Murat, who captured Mustapha himself.