The American Revolution, Episode 6: The War Rages On

After early successes, the American Continental Army faced nearly a whole year (1777) of defeat and retreat, including the fall of Philadelphia to British forces, necessitating the Second Continental Congress' move from what was then the national capital. Despite these being "the times that try men's souls," the British were unable to force an American surrender. And the Americans were able to secure a couple of incredible victories, at Trenton (NJ) and Saratoga (NY).