 Complete the following phrase:  Prior to the Siege of Petersburg, Gilbreath was given command of 800 engineers to create the breastworks for the siege. This was done during the night of June 2122, 1864. The Regiment took part in the siege until the end of July, when they were pulled back behind the lines for rest. In August it was decided to make a feint towards Washington. The regiment marched toward Washington, and was loaded onto ships and taken closer to Confederate lines. The following 