Kammala wannan jumla: Daga Oktoba 1863 zuwa Yuni 1865, Brannan shi ne shugaban sojojin bindiga na Ma'aikatar Cumberland, inda ya kula da tsaro a Chattanooga. Ya kasance a cikin yakin Missionary Ridge da kuma a cikin Atlanta Campaign inda ya halarci yakin Resaca, yakin Dallas da yakin Kennesaw Mountain. Ya kuma kasance a
kewaye da kuma mika wuya na Atlanta. An nada shi babban janar a cikin rundunar soja da kuma a cikin 'yan sa kai don Gallant da Meritorious Services a Atlanta Campaign da kuma a filin a lokacin Tawaye.