First Division

In the Army of the Potomac's Twelfth Corps, the First Division under Brig. General Alpheus W. Williams and Brig. General Thos. M. Ruger, with brigades led by Col. Archibald L. McDougall, Brig. Gen. Henry H. Lockwood, Brig. Gen. Thos. H. Ruger, and Col. Silas Colgrove, approached Rock Creek on the Baltimore Pike on July 1, moved by a cross road to occupy Wolf Hill, then retired at sunset and took position east of Rock Creek for the night. Because the First and Sixth Corps had been included in Gen. Slocum's command, Gen. Williams assumed command of the Corps, Gen. Ruger of the First Division, and Col. S. Colgrove of the Third Brigade. On July 2, Brig. Gen. Lockwood's Brigade joined the Corps early in the morning and, not having been assigned to a Division, was subject to the direct orders of the Corps Commander until assigned on July 5 to the First Division. At 8 a.m. the Division crossed Rock Creek and formed on the right of the Second Division, its left on Culp's Hill and its right in McAllister's Woods, where breastworks were constructed along the line. Late in the day the Division moved to support the Third Corps, and Johnson's Confederate Division advanced and occupied the vacant works. At daylight on July 3, the Division attacked the Confederate infantry and was hotly engaged with charges and counter-charges at different points until 10.30 a.m., when the Confederate forces retired. Early on July 4, Gen. Slocum with a detachment of infantry and a battery made a reconnaissance in front to Gettysburg without opposition. The Division's casualties were 5 officers and 90 men killed, 27 officers and 379 men wounded, and 1 officer and 30 men captured or missing, for a total of 533.

Gettysburg, Pennsylvania · United States