I have received this dispatch from Lt. Col. Comstock with news of the attack.
HEADQUARTERS ARMY OF THE POTOMAC, June 18, 1864-6 p.m.
Birney made an assault an hour ago, vigorous, with nine brigades, but was repulsed with considerable loss. The attack is reported to have been well made and the troops still in good condition. Burnside is about attacking, or has done so, but nothing has been heard from him yet, nor any heavy firing.
C. B. COMSTOCK,
Lieutenant-Colonel and Aide-de-Camp
The Papers of Ulysses S Grant, Vol 11, p 79
O.R., I, xl, part 2, p 155-6