August, 8th.—”I am monarch of all I survey.” Last night, intelligence being received that an attack was expected on Washington ; we were ordered to move there instanter, and at once the regiment was in motion. It got off in the course of the night, leaving me here in charge of about forty men who were too sick to be moved. I am left without provisions or money, except a few pounds of flour with which to feed and care for the sick, and the ten well ones left with me, to aid me and to look up deserters who have been left here. How am I to do it? I find a strong secession element here, and at times it is very bold. The hurrahs for Jeff. Davis are frequent, and all day the children are flaunting secession flags in our faces, and flying secession kites in our camp ground