At dawn, this battery led the First Corps on the initial Union advance south. Together with Matthews' Pennsylvania Battery, it fired point blank into the Cornfield and then into the fields farther south in a duel with S. D. Lee's Confederate guns across from the Dunker Church. From this exposed position, it helped sustain the infantry. The guns were then moved even farther south, into the Cornfield, where they fired directly into Confederates charging through the corn, from dawn to 7:30 a.m.
