The Fourth Alabama Painting by Don Troiani

Fourth Brigade, First Division

Brethschneider's Light Battalion Infantry

CAPTAIN R BRETHSCHEIDER – Company E, Second Michigan Infnatry

First Massachusetts Infantry Detachment – Twenty men from Companies B and G, under the command of First Lieutenant G H Johnston, Company E, and Sergeant G Forrest, Company G, were assigned to the battalion.
Second Michigan Infantry Detachment
Third Michigan Infantry Detachment
Twelfth New York Infantry Detachment

Reference

NOTES: The light battalion of infantry was temporarily organised prior to 21 July, 1861, with 40 men from each of the regiments of the Fourth Brigade, First Division, 160 in total.