General John Sullivan: a. destroyed forty Indian towns in a campaign against the Iroquois. b. encouraged American forces to treat Indians and their lands "truly well and gently." c. led pro-American Cherokee troops in campaigns against Lord Cornwallis in North Carolina. d. surrendered his forces to the Stockbridge Indians in a humiliating defeat.

a. destroyed forty Indian towns in a campaign against the Iroquois.

Explanation:

General John Sullivan was known for his military achievement during the Revolutionary War as serving under the Continental Congress. He commanded an expedition, which came to be known later as The 1779 Sullivan Expedition against the Iroquois. His campaign destroyed 40 Iroquois towns who had taken up arms against the American by siding with the British during the Revolutionary War.