How was Armistead able to go undercover and spy on the British and General Cornwallis?

He then graduated to full-blown espionage in the summer of 1781, when he infiltrated Charles Cornwallis's camp by posing as a runaway slave loyal to the British. He proved so convincing in the undercover role, that Cornwallis eventually enlisted him to work as a British spy

Explanation:

Cornwallis surrendered October 19, 1781

answer; /// (a) and (b) ; /// but i believe the correct answer is ; /apart from fines and jail time, driving under the influence puts the life of the driver and everyone else on the road at risk; (b)