How did slaves use the chaos and turmoil of the civil war to whittle away at their bondage?

The correct answer is by employing various means to undermine white mastery and expand control over their own lives.

They would either run away north and try to bring useful information to northerners, or they would sabotage the plantations and the land so that the southerners would have a more difficult time, or they would even attack southern plantation owners who enslaved them.