During her engagement with the Virginia the following morning, the Monitor’s two 11-inch Dahlgren smoothbores did moderate damage, wounding a few aboard the Virginia but killing no one.  As it turns out, the Confederates got a lucky break.  Although each 11-inch Dahlgren aboard the Monitor threw a shot weighing 168 pounds, Worden was under orders from the Navy Department to fire half-weight powder charges of 15 pounds for fear the guns would explode.  It seems they hadn’t been fully tested.