Slaves who ran away toward union troops were a. killed. b. armed and forced to fight against the rebels. c. given their freedom. d. returned to their masters. e. considered "contrabands of war."

Slaves who ran away toward Union troops were considered E. "contrabands of war."

Explanation:

Although some slaves were returned to their masters, most of them were kept in the soldiers’ lines and were allowed to help and participate in the war. They were called “contrabands of war”. These contrabands served as a big work force and proved themselves as extremely useful in the Civil War. By the end of it approximately 186,000 African American men had enlisted.

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