The effect of the Battle of Fort Sumter on Northern enlistment was Increased enlistment.

The Battle of Fort Sumter greatly influenced enlistment in the North, resulting in a significant surge of volunteers for the Union Army. The assault on the fort and its eventual capture stirred public sentiment in the North, shifting previously indifferent views on the conflict into a passionate determination to protect the Union. Many individuals experienced a revitalized sense of urgency and patriotism, leading them to enlist in substantial numbers. Additionally, President Abraham Lincoln's appeal for troops following the battle further spurred enlistment, as Northern communities united in support, facilitating a swift growth of Union military forces at the beginning of the war.