...cker's gaps, and about the 20th the two corps were united. The cavalry had acted as a screen in front of Longstreet during this advance, and, in this duty, had severe encounters with the enemy at Aldie , Middleburg, and Upperville, losing in them over 500 in killed, wounded, and missing. About June 22, as Hill and Longstreet drew near the Potomac, ready to cross, Stuart made to Lee a very unwise...