3. how did african americans in the south often union forces?

African Americans in the South often help Union forces by serving as spies and scouts. African Americans did all they could to help the Union army. This was especially true after the Emancipation Proclamation, as Lincoln attempted to free slaves from the control of Confederate states. This was one of the many reasons why African Americans in the South helped Union forces. These citizens often acted ignorant or didn't appear to be paying attention when Southerners discussed their next military moves. African Americans would then relay this information to the Union commanders, giving them a strategic advantage.

the answer is c. hope this

c. had saved colonel cresap's family from attack by other native americans.