numerous casualties, a list of which and of the battle of Crampton's Pass has been already furnished.
The conduct of the troops on this occasion, as at Crampton's Pass, is worthy of commendation.
W. T. H. BROOKS,
Brigadier-General, Commanding Brigade.
The ASSISTANT ADJUTANT-GENERAL,
No. 131. Report of Colonel William H. Irwin, Forty-ninth Pennsylvania Infantry, commanding Third Brigade, of the battles of Crampton's Pass and Antietam.
HDQRS. THIRD Brigadier, SECOND DIV., SIXTH CORPS,
Camp near Williamsport, Md., September 22, 1862.
MAJOR: In obedience to a division order, I have the honor to report that on the 14th instant this brigade was ordered to support Brigadier-General Brooks, who was engaged with the enemy at Crampton's Pass. It moved rapidly and steadily through Burkittsville. The shells thrown at its flank from the battery south of the pass did no injury. The crest of the mountain was reached after dark, and finding that the enemy had broken and that General Brooks had marched in pursuit into the valley, I reported to him just beyond the pass, and by his order established the Seventh Maine, Twentieth, Thirty-third, and Seventy-seventh New York Volunteers close in rear of Captain Ayres' battery, and sent forward the Forty-ninth New York Volunteers as skirmishers by the road leading to the Catoctin Mountain. Several prisoners were taken during the night.
We were encamped at the pass until Wednesday, the 17th, when we moved with the division toward Sharpsburg, near which very heavy and continuous firing was heard, and about 10 o'clock a. m. we formed on the field of battle near Antietam Creek, on the left of the First Brigade, and were instantly ordered into action by Major-General Smith, two of the regiments, the Thirty-third and Seventy-seventh New York, as skirmishers on the right, the Seventh Maine, Forty-ninth and Twentieth New York in line. The brigade, animated by the words and example of General Smith and by its own officers, dashed at the enemy in high spirits and good order, and was soon hotly engaged with them, but they could not endure our charge, and broke in confusion. A severe and unexpected volley from the woods on our right struck full on the Seventy-seventh and Thirty-third New York, which staggered them for a moment, but they closed up and faced by the rear rank, and poured in a close and scorching fire, driving back and scattering the enemy at this point. As soon as my line was formed, facing the belt of the woods and the open ground to its right, the men were ordered down. Pickets were posted on the crest of a small hill along our front, and all kept in readiness to hold firmly to the position or to attack. A battery of the enemy advanced and played with severity along my flank and through the line of the Twentieth New York, which, from the nature of the ground, was compelled to refuse its left, and thus received the fire along its entire front. Sharpshooters from the woods to the right and to the