Morris Morris' regiment,

"The 1st Louisiana Native Guard," organized as a Confederate Home Guard regiment in June of 1861 and was accepted for service as a Louisiana Militia unit by the Governor of Louisiana shortly thereafter, but was not documented as having seen combat as a Confederate regiment. After the Union occupation of New Orleans in 1861/62, some Black and mulatto officers and enlisted men of the regiment accepted Union service and formed a new USA regiment under the same name. Therefore, although Morris Morris served briefly as a Black Jewish Confederate officer, most of his military service and all of his combat service in the War was as a Union officer. The reorganized "Native Guard" did fight in many battles on behalf of the Union.
At the battle of Port Hudson the 1st Louisiana Native Guard, USA, was the first Black Regiment to fight in combat for the Union.

Historically, Morris Morris is more correctly listed listed as a Union officer.

SOURCE: Phil Downey

A Black, Jewish Officer in the Civil War