On 6 February, "Essex" joined the rest of Foote's gunboat squadron in the attack on Fort Henry. Porter's ship, second in line, sustained heavy fire from shore batteries and received at least 15 direct hits. About half an hour into the fray, "Essex" took a 32-pound shot through her bow shield. It pierced her boilers, releasing steam which severely scalded 28 men. Commander Porter—himself blinded and scalded—continued to conn his ship until she was clear of the action.