Headquarters Cavalry Corps,
Camp near Upperville, 5.20 P. M., June 21.
Brigadier-General S. Williams:
General: I moved with my command this morning to Middleburg, and attacked the cavalry force of the Rebels under Stuart, and steadily drove him all day, inflicting a heavy loss at every step.
I drove him through Upperville into Ashby's Gap.
We took two pieces of artillery, one being a Blakely gun, and three caissons, besides blowing up one; also, upwards of sixty prisoners, and more are coming; a lieutenant-colonel, major, and five other officers, besides a wounded colonel and a large number of wounded Rebels left in the town of Upperville.
They left their dead and wounded upon the field; of the former I saw upward of twenty.
We also took a large number of carbines, pistols, and sabres. In fact, it was a most disastrous day to the Rebel cavalry.
Our loss has been very small both in men and horses.
I never saw the troops behave better, or under more difficult circumstances.
Very heavy charges were made, and the sabre used freely, but always with great advantage to us.