June 23, Sundown.—As I sit writing this paragraph I see a train of about thirty huge four-horse wagons, used as ambulances, fill'd with wounded, pa**ing up Fourteenth street, on their way, probably, to Columbian, Carver, and Mount Pleasant hospitals. This is the way the men come in now, seldom in small numbers, but almost always in these long, sad processions. Through the past winter, while our army lay opposite Fredericksburg, the like strings of ambulances were of frequent occurrence along Seventh street, pa**ing slowly up from the steamboat wharf, with loads from Aquia creek.