How did some formerly enslaved african americans in the south respond to advancing union forces

They served as scouts and spies for the union

The correct answer is African Americans served as scouts and spies for the Union.

During Civil War African Americans often played the role of spies, according to William Stroke’s Account of his War Record over 90% of the Union War Force consisted of African Americans. They could not be in the battlefield because of lack of experience and poor training but they worked behind the scenes as scouts, raiders or spies, they provided the Union advantages.

the roman army grew in size and became dominant in the mediterranean region.

a. the astrolabe could determine the correct latitudinal location of the ship