Events Leading to Valley Forge By mrsoskil May 1, 1777 Washington broke winter camp at Morristown Jun 1, 1777 British army moved to Staten Island Aug 20, 1777 The enemy appeared in Chesapeake Bay Sep 17, 1777 Battle of Brandywine. Sep 21, 1777 Howe's columns reached the Schuylkill River in force Oct 4, 1777 Battle of Germantown Nov 10, 1777 Lord Howe's ships invested Fort Mifflin Dec 19, 1777 Washington's troops arrived upon the hills at Valley Forge