The 207th transferred to the IX Corps of the Army of the Potomac on 24 November, and participated in a demonstration on the left flank without fighting. After returning to the corps lines, it encamped on the Army Line Railroad near Fort Prescott on the extreme right flank. The Provisional Brigade was organized during December into the 3rd Division of the corps, commanded by Brigadier General John F. Hartranft. The 207th became part of the 2nd Brigade of Colonel Joseph A. Mathews alongside the 205th and 211th Pennsylvania. During the northern hemisphere winter of 1864–1865, the regiment conducted training and participated in several forays without participating in fighting, including support of the Weldon Railroad expedition between 7 and 11 December, and the Battle of Hatcher's Run from 5 to 7 February 1865. At Hatcher's Run, Cox took temporary command of the brigade and the regiment went into line of battle when it reached the creek as there was heavy fighting to the left of the regiment. The 207th fortified its position with log and earth breastworks at night, expecting an attack. However, no Confederate attack occurred and the regiment returned to camp after spending four days in the rain, sleet, and snow.