Germantown, Philadelphia in the context of Philadelphia County, Pennsylvania

The Philadelphia campaign (1777–1778) was a British military campaign during the American Revolutionary War designed to gain control of Philadelphia, the Revolutionary-era capital where the Second Continental Congress convened, formed the Continental Army, and appointed George Washington as its commander in 1775, and later authored and unanimously adopted the Declaration of Independence the following year, on July 4, 1776, which formalized and escalated the war.

In the Philadelphia campaign, British General William Howe failed to draw the Continental Army under George Washington into a battle in North Jersey. Howe then embarked his army on transports, and landed them at the northern end of the Chesapeake Bay, where they began advancing north toward Philadelphia. Washington prepared defenses against Howe's movements at Brandywine Creek, but was flanked and beaten back in the Battle of Brandywine on September 11, 1777. After further skirmishes and maneuvers, Howe entered and occupied Philadelphia. Washington then unsuccessfully attacked one of Howe's garrisons at Germantown prior to retreating to Valley Forge for the winter, where he and 12,000 faced the harshest winter of the war, including insufficient food and clothing.

The Battle of Germantown was a major engagement in the Philadelphia campaign of the American Revolutionary War. It was fought on October 4, 1777, at Germantown, Pennsylvania, between the British Army led by Sir William Howe, and the American Continental Army under George Washington.

After defeating the Continental Army at the Battle of Brandywine on September 11, and the Battle of Paoli on September 20, Howe outmaneuvered Washington, seizing Philadelphia, the capital of the United States, on September 26. Howe left a garrison of some 3,000 troops in Philadelphia, while moving the bulk of his force to Germantown, then an outlying community to the city. Learning of the division, Washington determined to engage the British. His plan called for four separate columns to converge on the British position at Germantown. The two flanking columns were composed of 3,000 militia, while the center-left, under Nathanael Greene, the center-right under John Sullivan, and the reserve under Lord Stirling were made up of regular troops. The ambition behind the plan was to surprise and destroy the British force, much in the same way as Washington had surprised and decisively defeated the Hessians at Trenton. In Germantown, Howe had his light infantry and the 40th Foot spread across his front as pickets. In the main camp, Wilhelm von Knyphausen commanded the British left, while Howe himself personally led the British right.

The Germantown Petition was a protest by American Quaker settlers in Pennsylvania demanding the abolition of slavery, the first formal petition of its kind. It was authored by Francis Daniel Pastorius, the founder of Germantown, Pennsylvania, with support from several of the Original 13 settlers of Pennsylvania including Derick op den Graeff and Abraham op den Graeff, who signed it on behalf of the Germantown Meeting of the Religious Society of Friends. A highly controversial document, Friends forwarded it up the hierarchical chain of their administrative structure—monthly, quarterly, and yearly meetings—without either approving or rejecting it. The petition effectively disappeared for 150 years into the Philadelphia Yearly Meeting's archives, but was republished in 1844 in support of abolitionism after its rediscovery by the Philadelphia antiquarian Nathan Kite.