In June, Cornwallis marched to Williamsburg, where he received a confusing series of orders from General Sir Henry Clinton that culminated in a directive to establish a fortified deep-water port (which would allow resupply by sea). In response to these orders, Cornwallis moved to Yorktown in late July, where his army began building fortifications. The presence of these British troops, coupled with General Clinton's desire for a port there, made control of the Chesapeake Bay an essential naval objective for both sides.