On the 5th instant a scouting party, under Captain Lawson, started for Middle Fork bridge, a point eighteen miles from camp. At eight o'clock last night, when I brought the battalion from the drill-ground, I found that a messenger had arrived with intelligence that Lawson had been surrounded by a force of probably four hundred, and that, in the engagement, one of his men had been killed and three wounded. The camp was alive with excitement. Each company of the Third had contributed five men to Captain Lawson's detachment, and each company, therefore, felt a special interest in it. The messenger stated that Captain Lawson was in great need of help, and General McClellan at once ordered four companies of infantry and twenty mounted men to move to his assistance. I had command of the detachment, and left camp about nine o'clock P. M., accompanied by a guide. The night was dark. My command moved on silently and rapidly. After proceeding about three miles, we left the turnpike and turned onto a narrow, broken, bad road, leading through the woods, which we followed about eight miles, when we met Captain Lawson's detachment on its way back. Here we removed the wounded from the farm wagon in which they had been conveyed thus far, to an ambulance brought with us for the purpose, countermarched, and reached our quarters about three o'clock this morning.
I will not undertake to give the details of Captain Lawson's skirmish. I may say, however, that the number of the enemy killed and wounded, lacerated and torn, by Corporal Casey, was beyond all computation. Had the rebels not succeeded in getting a covered bridge between themselves and the invincible Irishman, he would, if we may believe his own statement, have annihilated the whole force, and brought back the head of their commanding officer on the point of his bayonet.
SOURCE: John Beatty, The Citizen-soldier: Or, Memoirs of a Volunteer, p. 14-5