They didn't have basic supplies as food, weapons and blankets. They didn't have money, too. The British blockade was also successfull in preventing supplies to come from other countries.
They actually pushed the British into Yorktown because they knew the British were beginning to lose. Then after the British were surrounded by land the French started firing at them from sea until they surrendered
The president vetoing a bill from Congress. Congress overruling that veto with a 2/3rds vote. The Supreme Court striking down a law as unconstitutional.