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In the summer of 1777, British General Sir William Howe moved his army by sea to the Chesapeake and marched north toward Philadelphia, seeking to draw out and defeat General George Washington. The armies first clashed at the Battle of Brandywine on September 11, where a flanking maneuver forced the Americans to retreat, opening the road to the capital. Subsequent actions at the Battle of the Clouds and the nighttime attack at Paoli reflected the confusion and intensity of the campaign, but failed to stop the British advance.

On September 26, 1777, the British entered Philadelphia unopposed, forcing the Continental Congress to flee. Yet the capture of the city did not destroy Washington’s army, which remained intact and continued to contest British control. In October, Washington attempted to retake the initiative at Germantown but was repulsed. Meanwhile, British forces struggled to secure supply lines along the Delaware River, leading to a prolonged fight for control of key positions like Fort Mifflin and Fort Mercer.

As winter approached, the campaign settled into a stalemate. After maneuvering and skirmishing around Philadelphia, Washington withdrew to winter quarters at Valley Forge in December 1777. Despite severe hardship, the Continental Army emerged more disciplined and resilient. When news arrived that France had entered the war on the American side, the British abandoned Philadelphia in June 1778, marking the end of the campaign.