Key figures: General William Howe (British Commander-in-Chief), Major General Charles Grey (British), Brigadier General James Grant (British), General George Washington (American Commander-in-Chief), Major General Anthony Wayne (American), Benjamin Franklin (American diplomat, absent in Paris)
Summary
The British occupation of Philadelphia began on September 26, 1777, when advance elements of General William Howe’s army entered the city without resistance, fifteen days after the decisive American defeat at the Battle of Brandywine. Philadelphia was then the largest city in British North America, with a population of approximately 30,000, and had served as the meeting place of the Continental Congress since 1775. The Continental Congress evacuated the city on September 18, 1777, relocating first to Lancaster, Pennsylvania, and then to York, Pennsylvania, where it continued to function.
After crossing the Schuylkill River on September 22–23, Howe encamped the main body of roughly 9,000 troops at Germantown, about seven miles northwest of the city, while General Charles Cornwallis led an advance force of approximately 3,000 British and Hessian grenadiers into Philadelphia itself on September 26. The British immediately established a military government under Howe’s authority, requisitioned private property, and began fortifying the city’s northern perimeter with a chain of redoubts stretching from the Delaware to the Schuylkill rivers.
The occupation lasted precisely eight months, from September 26, 1777, to June 18, 1778, when the British evacuated in response to strategic pressures following France’s entry into the war. Upon evacuation, the British column — now under General Henry Clinton, who had replaced Howe — withdrew across New Jersey to New York, pursued by Washington’s reorganized army, which fought them to a tactical draw at the Battle of Monmouth on June 28, 1778.
The City Under Occupation
Philadelphia’s population of roughly 30,000 included a large Loyalist community and a significant Quaker population that maintained political neutrality. Many Patriot families and members of the merchant class had evacuated before the British arrival; those who remained included Loyalist supporters, individuals with British ties, and those too old, ill, or committed to their property to leave.
Howe established his headquarters at the house of Richard Penn (grandson of William Penn) at Sixth and Market Streets. British officers were billeted in private homes throughout the city; ordinary soldiers were quartered in schools, churches, and warehouses. The Pennsylvania State House (now Independence Hall), where the Declaration of Independence had been signed in 1776, was converted into a British prison for American prisoners of war.
The British army commandeered supplies, horses, firewood, and provisions from the city’s population and from the surrounding Chester and Bucks counties farmland. This requisitioning created significant civilian hardship and generated lasting resentment. Despite the occupation, Philadelphia continued to function commercially; British officers participated in a busy social season that included horse races, dances, and theatrical performances — sharply contrasting with the desperate conditions endured by Washington’s army twenty miles away at Valley Forge.
The most celebrated social event of the occupation was the Mischianza, an elaborate fête staged by British officers in honor of Howe on May 18, 1778, featuring a medieval-themed tournament, banquet, and fireworks. The event — organized by Captain John André, who would later be executed as a spy in 1780 — was later criticized by British officials as inappropriate given the army’s strategic difficulties.
The Battle of Germantown and Control of the Delaware
Washington attempted to recapture Philadelphia by attacking the British garrison at Germantown, then the northern suburb of the city, on October 4, 1777. His plan involved four separate columns converging simultaneously on the British encampment — an ambitious concept that the army’s command and communication capabilities could not fully execute. Fog, friendly-fire incidents, and a tenacious British defense of the Chew House (Cliveden) disrupted the attack, and the American assault was ultimately repulsed with approximately 1,000 American casualties to British losses of around 535.
Control of the Delaware River, the main supply artery to Philadelphia, remained contested throughout the occupation. The British required access to the river to resupply the city from their naval base at New York. American forces had constructed defensive works at Fort Mifflin (on Mud Island) and Fort Mercer (at Red Bank, New Jersey), and a Hessian assault on Fort Mercer had been bloodily repulsed at the Battle of Red Bank on October 22, 1777. After a sustained British bombardment, the American garrison abandoned Fort Mifflin on the night of November 15; five days later, as Cornwallis advanced with about 2,000 troops, the defenders of Fort Mercer burned the works and evacuated on the night of November 20–21. With the Delaware forts eliminated, the river route was open, but only after the city had endured six weeks of supply difficulties.
Strategic Context and the French Alliance
The occupation of Philadelphia, while symbolically significant, proved strategically decisive in the wrong direction for Britain. Three weeks after Howe entered Philadelphia, the surrender of General John Burgoyne’s entire army at Saratoga on October 17, 1777 — see Battles of Saratoga — demonstrated that Britain could not simultaneously conduct major offensive operations in the north and occupy a hostile city in the south. The twin news of Saratoga reached Paris in December 1777; Benjamin Franklin, serving as American minister to France, used it to secure a formal military alliance signed on February 6, 1778.
When France entered the war, Britain’s strategic priorities shifted fundamentally. Philadelphia became a liability: an occupied city deep in enemy territory, requiring garrison forces that could not be deployed elsewhere, vulnerable to a French naval assault, and strategically irrelevant to British war aims. The British government ordered Howe’s successor, General Henry Clinton, to evacuate the city and consolidate forces in New York. The evacuation began on June 18, 1778, and Washington’s army reentered Philadelphia on June 19.
Significance
The occupation of Philadelphia illustrates a central paradox of the Revolutionary War: British conventional military superiority could win battles and capture cities, but could not destroy the Continental Army or suppress the rebellion’s political infrastructure. Capturing the American capital produced no collapse in American resistance; the Continental Congress simply relocated and continued to function. Meanwhile, Howe’s army was pinned to the defense of a city rather than pursuing the annihilation of Washington’s force.
The period of the occupation also coincided with the transformation of the Continental Army at Valley Forge. While British officers attended the Mischianza, Baron von Steuben was drilling Washington’s soldiers in Prussian tactical formations. The army that returned to Philadelphia in June 1778 was a substantially more professional force than the one that had retreated the previous September — as the British discovered at Monmouth twelve days after the evacuation. The occupation thus inadvertently provided the time needed for the American military reorganization that sustained the war to its successful conclusion at Yorktown in 1781.