King John was able to destroy the bridge to prevent possible support from London to cross the river. He also scared away 700 riders of actual support from there by sending rumor that he is heading towards to intercept them. So it seems that castle defenders couldn't hold or protect the bridge. They could possibly make the water crossing difficult by shooting arrows from the walls, so it was necessary to capture the walls, but was it necessary to sit there another month sieging the keep?
no subject
Date: 2015-09-01 04:14 pm (UTC)