The 206th was transferred to the X Corps on 26 October and joined the 3rd Brigade of its 1st Division, along with the 11th Maine, 24th Massachusetts, 10th Connecticut, and 100th New York. Shortly afterwards, it went into winter quarters north of Fort Harrison, and continued training while on normal camp duties for the next several months. The regiment became part of the 1st Division of XXIV Corps on 3 December when X Corps was split. On 27 March, when the Army of the James began its movement to attack positions for the Petersburg breakthrough, the 206th was detached from the brigade and attached to the 3rd Division, remaining in camp on provost duty in spite of protests from the regiment. Brady was ordered to organize the convalescents of the 1st Division in preparation for movement. After the breakthrough, the 206th was among the first units to march into Richmond unopposed on 3 April, to discover that the Confederate forces had evacuated. Between 29 March and 9 April, the regiment suffered casualties of seven wounded and one officer and one man captured or missing, for a total of nine.