Rubuta ci gaba ga wannan sakin layi - Tare da barkewar yakin basasa, Brooks ya zama brigadier janar na masu sa kai a watan Satumbar 1861. Ya umurci Brigade na 2, 2 na Division na IV Corps a cikin Kamfen na Peninsula, da kuma Brigade na 2, 2 na Division na VI Corps a cikin Yakin Kwanaki Bakwai, inda aka ji masa rauni a yakin Savage's Station
Ka yi haƙuri. Da yake murmurewa, ya sake komawa umurnin brigade don Kamfen na Maryland kuma ya jagoranci mutanensa a Crampton's Gap, inda suka kama wata alama ta yakin basasa na 16 na Virginia. A yakin Antietam, brigade na Brooks ya kasance a cikin ajiya, ko da yake a karkashin "harbe-harben wuta na duka bindigogi da sharpshooters" na tsawon sa'o'i 48.