_July 10._--This morning, at five o'clock, the cavalry advanced from Boonsboro', passed through Keedysville, and crossed the Antietam about ten o'clock. At twelve o'clock we engaged the enemy at Jones' Cross Roads. The Harris Light led the advance, dismounted. The Rebels were driven three consecutive times from as many positions which they had chosen. Their resistance was by no means strong nor determined. Before night Buford moved his command to Sharpsburg, on the extreme left of our lines, and Kilpatrick advanced to a position on the extreme right, in the vicinity of Hagerstown, where he covered the road to Gettysburg. On the eleventh only picket skirmishes occupied the time. But on the twelfth Kilpatrick, supported by a brigade of infantry under the command of Brigadier-General Ames, of Howard's Corps, advanced upon the enemy near Hagerstown, drove them from their works, and then out of the streets of the city, and took permanent possession. This successful movement greatly contracted our lines, and brought our forces into a better position. At the close of this enterprise, as we are informed, General Meade called a council of war, at which was discussed earnestly and long the propriety of attacking the enemy. Notwithstanding the anxiety of the chief commander to advance and reap fully the fruit of Gettysburg, five of his corps commanders, out of eight, argued against the measure, and as Meade did not desire to assume the grave responsibility of a movement against such protests, no move was immediately attempted.