 Complete the following phrase:  In the assault at Cold Harbor, June 1, 1864, the corps sustained another severe loss, 2,715 of its number killed or wounded. Accompanying the army to Petersburg, it participated in the preliminary operations incidental to the investment of that stronghold. But its stay was of short duration. Lt. Gen. Jubal A. Earlys invasion of Maryland necessitated a transfer of troops to confront him, and the VI Corps selected for that duty in the Valley Campaigns of 1864. On July 6, Rickettss 3rd Division embarked at City Point, and, landing at Baltimore on July 8, marched out to meet Early. This division took part in the 