How did Hiram Revels serve others while he was a minister?

He became a minister in a Methodist Episcopal Church in Baltimore,

Explanation:

Maryland, where he also served as a principal of a black high school. During the American Civil War, Revels served as a chaplain in the United States Army.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).