A Republic in Motion

Campaign map · Episode 4

Northern and Philadelphia campaigns, 1777

Two British operations produced opposite visible results: Philadelphia was occupied, while Burgoyne's northern army surrendered. Geography explains how both could happen without either result ending the Revolution.

Show stages
Northern and Philadelphia campaigns, January 1777 to February 1778A schematic geographic map showing British and allied operations in solid red, Continental and militia operations in dashed blue, the northern corridor from Ticonderoga to Saratoga, the western operation through the Mohawk Valley, the Philadelphia campaign, and the route to Valley Forge. A dotted gold marker indicates diplomatic consequence rather than troop movement.New YorkPennsylvaniaNew JerseyHudson River corridorDelaware RiverMohawk Valley · contested corridor, not a borderPrincetonJanuary 3, 1777MorristownWinter 1777TiconderogaJuly 5–6, 1777OriskanyAugust 6, 1777BenningtonAugust 16, 1777Freeman's FarmSeptember 19, 1777Bemis HeightsOctober 7, 1777Saratoga surrenderOctober 17, 1777AlbanyOctober 17, 1777Head of ElkSeptember 11, 1777BrandywineSeptember 11, 1777PhiladelphiaSeptember 26, 1777–June 18, 1778GermantownOctober 4, 1777Valley ForgeDecember 19, 1777–June 19, 1778N
British and allied operation Continental and militia operation political consequence, not troop movement contested corridor, not territorial border approximate occupation focus
Geographic orientation, not a survey-grade reconstruction. Movement lines connect strategic stages rather than tracing daily roads. “British and allied” does not imply that British regulars, German troops, Loyalists, and Native warriors shared one political status or purpose. The Mohawk corridor sits within Haudenosaunee homelands and divided communities; it is intentionally not drawn as a bounded tribal territory.
Read the map as a chronological and evidentiary table
Canonical datesActorsMovement or relationshipInterpretive note
January 3, 1777 → Winter 1777Continental and militiaPrinceton → MorristownThe Princeton counterstroke gives way to a winter contest over forage, outposts, information, and political control in New Jersey.
July 5–6, 1777 → September 19, 1777 → October 7, 1777 → October 17, 1777British and alliedTiconderoga → Saratoga surrenderBurgoyne advances south through a lengthening supply system before the campaign contracts around Saratoga.
August 16, 1777British and alliedSaratoga surrender → BenningtonA detachment seeking horses and supplies enters contested country and suffers losses Burgoyne cannot replace.
August 6, 1777British, Loyalist, and Native forcesOriskany → AlbanyThe arrow marks the intended Mohawk–Albany operational direction, not a completed march or one undifferentiated political coalition.
August 16, 1777 → September 19, 1777 → October 7, 1777 → October 17, 1777Continental and militiaBennington → Bemis HeightsMilitia and Continental reinforcements accumulate as Burgoyne's choices and supplies narrow.
September 11, 1777British and alliedHead of Elk → BrandywineHowe approaches Philadelphia from the Chesapeake rather than moving north to join Burgoyne.
September 11, 1777 → September 26, 1777–June 18, 1778British and alliedBrandywine → PhiladelphiaVictory at Brandywine opens the route to occupation of the American capital but does not capture Congress or destroy Washington's army.
October 4, 1777Continental and militiaGermantown → PhiladelphiaThe failed American counterattack demonstrates continuing field capacity without reversing occupation.
December 19, 1777–June 19, 1778Continental and militiaGermantown → Valley ForgeThe army enters a winter encampment whose supply geography extends far beyond the camp perimeter.
October 17, 1777 → February 6, 1778Political consequenceSaratoga surrender → AlbanyThis short marker represents an outward diplomatic consequence, not a troop movement: Saratoga alters the evidence on which French recognition and alliance are calculated.
Read the political-geography qualifications
  • Mohawk Valley political and military corridor: A route through Haudenosaunee homelands and divided communities, not a border or a single allegiance zone.
  • Approximate occupation focus: Concentrated British military presence and administration, not complete control or uniform Loyalism.

How to use this map

Toggle the winter, northern, Philadelphia, and outcome layers. The chronological table carries the operational claims without relying on position or color. Solid triangular red paths, dashed blue paths with circular endpoints, and dotted gold paths distinguish British/allied operations, Continental/militia operations, and political consequences.

What the map refuses to imply

Movement arrows do not mean stable territorial control. The Philadelphia wash marks concentrated occupation, not uniform Loyalism. The Mohawk Valley is shown as a contested political and military corridor within Haudenosaunee homelands, not as the border of a single timeless “tribal territory.” British regulars, German troops, Loyalists, Mohawk and Seneca warriors, Oneida warriors, Continental troops, and militia did not share one political status merely because the map sometimes groups them by an operation.

Source and derivation rules

Every plotted point links to one canonical event, and every movement links to one or more canonical events. Displayed dates are derived at build time from those event records rather than repeated in map data. The validator requires event and source references for points, movements, and context layers, and rejects a movement if it introduces its own date label.

Locations use approximate modern coordinates for orientation. Operational sequence and geography are checked primarily against Kevin Weddle for the Saratoga campaign, Alan Taylor and Holger Hoock for the wider war and Philadelphia, Colin Calloway for Native-centered political geography, David Hackett Fischer for the winter counterstroke, and Ricardo Herrera and James Kirby Martin/Mark Lender for army and Valley Forge systems.

WeddleTaylorHoockCallowayFischerHerreraLender and Martin