The battle of Fort Bisland lasted only two days before Confederate forces abandoned the fort on April 13, the key to Banks' success lie in his fervor and show of force. Before the battle, Taylor was aware of Banks' imminent attack due to successful cavalry scouting under Brig. Gen. Alfred Mouton, though this information did him little good in the battle due to the immediate shelling from the Union by the captured Confederate ship Diana the battle commenced, this artillery fire continued into the next day. The ship was damaged in the fighting and fired by the crew to prevent capture.  On April 13, Union forces advanced on the fort and after fierce fighting that resulted in the loss of over 200 men for the Union and nearly 500 for the Confederacy the battle died down that evening. Upon learning of Banks' reinforcements poised to cut off any Confederate retreat, Taylor evacuated his men from the fort that night and the Union forces discovered it abandoned the next day.