With the objective completed, the British withdrew back inside their fortifications. The total British and Hanoverian casualties in the sortie were two killed and 25 wounded. Spanish losses were over 100 men, which included thirty prisoners; a number of these were blue-coated Walloon soldiers of the Walloon Guards. The British did damage to the extent of two million pounds to the besiegers: fourteen months of work by the Spanish and a considerable quantity of ammunition had been destroyed. British troops and pioneers spiked ten 13-inch mortars and eighteen 26-pounder guns in the Spanish siege works. In addition the platforms and beds on which the guns were based were destroyed. As the British returned after their victorious sortie, the garrison watched in amazement as huge explosions from the ammunition ripped through the Spanish lines and destroyed what was left of them.