In the Florida Campaign, Montgomery was placed in command of
a brigade, containing the Fifty-fourth
Massachusetts and First
North Carolina Colored Volunteers (later known as the
Thirty-fifth
United States Colored Troops). One of his regiments was as
yet untried in combat, while the other was the most famous black
unit of the entire war. In the battle his brigade helped protect
the withdrawal of the defeated Union army, allowing it to escape
back into the Jacksonville defenses. Montgomery's career
declined rapidly after Olustee, and he resigned his commission in
September 1864.
Colonel Montgomery's official report of the battle
Union Order of Battle
Battle of Olustee Home Page
http://battleofolustee.org/