Why did the british win the Battle at Brandywine Creek?

George Washington, at the time a general, inaccurately gauged the British forces, believing them to be a lot smaller. The British employed a flanking maneuver, where the army was split into 3 parts. One to march head on to the Americans, with the attention focused on them. Oblivious to the Americans, the other two parts came up from behind on either side.