Henry W. Slocum to G. H. SHarpg, June 21, 1863

(Copy received, War Department, 8 p. m.) Col. G. H. SHarpg, Deputy Provost-Marshal, Army of the Potomac: At 4p. m. 40 of the First Maryland Cavalry routed the enemy in Frederick, leaving soon after. A force of 150 rebel cavalry imme- diately ees the town, and are there now. The force to defend the railroad bridge here is insufficient, and an attempt to destroy it may be made to-night. ; LEESBURG, V. A., June 21, 1863. (Copy received, War Department, 8.23 p. m.) Major-General BUTTERFIELD, Headquarters Army of the Potomac: A deserter from Pickett’s division, Longstreet’s corps, came in this evening. Longstreet’s corps is near Snicker’s Gap. McLaws’ division is at Ashby’s Gap. He says the rebel soldiers think Ewell’s corps isin Maryland, and that Hill’s corps is in rear of Longstreet’s, but is to follow on; that the whole army is to go into Maryland.

H. W. SLOCUM,