sentences:  His unit later participated in several skirmishes during the Federal retreat to Harrison's Landing.After the conclusion of the Peninsula Campaign, Abercrombie was replaced as commander in favor of younger officers and spent the next year involved in the defense of Washington, D.C., and, in 1864, headed various Union supply depots in Virginia during the Overland Campaign.Abercrombie commanded the troops that defended a depot in Fredericksburg, Virginia, in June 1864 against an attack by Hampton's Legion.