Sullivan 's men were attacked .
Sullivan 's men were sent into retreat by a surprise flanking attack at Brandywine but were eventually able to leave the field in good order when they were reinforced by troops under the command of General Nathanael Greene .
Sullivan 's men were attacked and sent into retreat by a surprise flanking attack at Brandywine but were eventually able to leave the field in good order when they were reinforced by troops under the command of General Nathanael Greene .