De la Motte and his army continued to advance till they reached Mers el-Kebir, where they discovered a field in which the Janissaries had gathered in, it was promptly destroyed, making about 300 Janissaries flee, all of which belonged to Mers el-Kebir's garrison.[3] Terrified by the intense firepower of the grenadiers, the troops of the Castle of Mers el-Kebir capitulated, on the condition that they would be allowed to retreat to Algiers.[3] Immediately after, De la Motte´s army besieged Mers el-Kebir.[3] Montemar, seeing how successful this had been, then sent his army to the nearby mountains where the majority of the enemy lay, but these, terrified and demoralised, retreated that very night to Oran,[2][3] which was also abandoned along with all its forts and castles used for defence.[2] The quality and discipline of the Spanish army, without a doubt terrified Bey Hassan's troops.[2] The next day, 1 July, Montemar, through a message from the French consul in Oran, found out about this news and immediately sent ot a detachment to confirm this.[2] The news was in fact true, and the French consul himself,[2] came out to receive the Spanish troops, which entered the city without any trouble, as it was almost desserted, as was the Palace of Bey.[2] The Spanish captured 80 bronze pieces of artillery,[2] 50 iron pieces and 12 bells,[2] and innumerable artifacts of war, and supplies, enough to supply the city for at least three months.[2] Finally, the next day, 2 July, the city of Mers el-Kebir also capitulated to De la Motte's troops.[2]