Twelfth U.S. Infantry

As part of the Army of the Potomac's Fifth Corps, Second Division, First Brigade, the Twelfth U.S. Infantry, eight companies under Captain Thomas S. Dunn, arrived on July 2 in the morning and took position near the Twelfth Corps on the right. It then moved with the division from the right to the left of the line and at 5 p.m. crossed Plum Run near Little Round Top with the brigade, supporting the Second Brigade in its advance to the crest of the rocky wooded hill in front. Facing left, it engaged the Confederates but retired under heavy fire on both flanks and from the rear after the Confederates gained possession of the Wheatfield behind the brigade, then went into position on Little Round Top. On July 3 it remained in the same position. On July 4 the regiment, with the 14th, supported the 3d, 4th, and 8th U.S. Infantry in a reconnoissance and developed a force of Confederate infantry and artillery in front. Its casualties were 1 officer and 7 men killed, 4 officers and 87 men wounded, and 13 men missing.

Pennsylvania · United States