...neral) was, on the 23d, placed in charge of the cavalry on York river, for the purpose of establishing a camp of instruction and making judicious disposition of the pickets and videttes; the same day Col. D. H. Hill (later a Confederate lieutenant-general) assumed command of the post at Yorktown. On the 28th, two more companies of cavalry were ordered from the camp of instruction at Ashland to Yorktown; Hodges...