VIDEO | Park Ranger David Lawrence describes the trials and successes of the Continental Army at Valley Forge.

VIDEO | Barnet Schecter highlights the key battles of the New York Campaign as the British Army chased American forces through New York during the summer of 1776 and winter of 1777.

VIDEO | Thomas McGuire, Author of The Philadelphia Campaign: Brandywine and the Fall of Philadelphia , explains the Battle of Brandywine.