Key Facts
- Duration
- 1777–1778
- Continental Army at Valley Forge
- ~12,000 troops
- Key British failure
- No support given to Burgoyne's northern campaign
- Philadelphia occupied
- September 1777 – June 1778
- Strategic result
- Both armies returned to roughly pre-campaign positions
Strategic Narrative Overview
After failing to engage Washington in New Jersey, Howe transported his army by sea to the northern Chesapeake Bay and marched north. Washington prepared defenses at Brandywine Creek but was flanked and defeated on September 11, 1777. Howe occupied Philadelphia, and Washington's counterattack at Germantown failed. Washington then withdrew to Valley Forge for a brutal winter encampment, while Burgoyne's unassisted northern army was crushed at Saratoga.
01 / The Origins
Britain sought to crush the American Revolution by seizing Philadelphia, the seat of the Second Continental Congress and symbolic heart of the rebellion. General William Howe planned to draw Washington into a decisive engagement and capture the revolutionary capital, thereby undermining colonial morale and governance. The campaign unfolded alongside Burgoyne's separate northern offensive, creating strategic pressure on two fronts against the Continental Army.
03 / The Outcome
Howe resigned and was replaced by General Sir Henry Clinton, who was ordered in 1778 to evacuate Philadelphia and consolidate forces in New York City ahead of an anticipated Franco-American offensive. Loyalists fled Philadelphia fearing reprisals. Washington's army pursued the withdrawing British, clashing at the Battle of Monmouth. The campaign ended with both sides occupying essentially the same strategic positions as before it began.
Belligerents & Mobilization Analysis
Side A
1 belligerent
General William Howe, General Sir Henry Clinton.
Side B
1 belligerent
George Washington.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.