The regiment was attached to 3rd Separate Brigade, VIII Corps, Middle Department, to July 1864.
The 11th Maryland Infantry mustered out of the service at Baltimore on June 15, 1865.
The regiment reorganized into three companies for one year service in December 1864.
Company C on detached service at Relay House, Baltimore & Ohio Railroad.
The regiment lost a total of 29 men during service, all due to disease.