Jon Day gives a conservative estimate of Royalist casualties as 1,200 killed, wounded and sick, with another 800 lost to desertion. The siege had come close to succeeding, and by the end of it the defenders were down to their last barrels of gunpowder.
Jon Day estimates that Royalist casualties during the siege were approximately 1,200 injured, sick, or absent, in addition to 800 who deserted. The siege nearly succeeded, leaving the defenders with little more than empty gunpowder barrels by its end.