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The Battle of Monmouth, 1778: the army Valley Forge built

American Revolutionary War · 28 June 1778 · United States vs Britain · ~6 min read · Updated October 2026

Washington rallying the troops at the Battle of Monmouth, painting by Emanuel Leutze

At a glance

United States (Continental Army)Gen. George Washington
vs
Great BritainGen. Sir Henry Clinton
Date
28 June 1778
Location
Monmouth Court House, New Jersey
Period
American Revolutionary War
Outcome
Inconclusive; strategic American success
By the numbers
SideStrengthLosses
United States~11,000 to 13,000~350 to 500 killed, wounded or missing
Great Britain~11,000 to 15,000~350 to 500 killed and wounded, plus losses to heat

Figures are approximate; many on both sides fell to heatstroke.

Quick answer

The Battle of Monmouth, fought on 28 June 1778 in New Jersey1, was tactically inconclusive but a strategic success for the Americans2. Washington attacked the British column as it withdrew from Philadelphia to New York; an early American retreat under Charles Lee nearly wrecked the attack, until Washington rode up and rallied the line. His troops then held their ground against British regulars in fierce heat, proof of how far the Continental Army had come since Valley Forge.

The winter at Valley Forge had remade the Continental Army. At Monmouth, in appalling summer heat, Washington's men showed what that training was worth, standing toe to toe with British regulars and refusing to break.

Part of The greatest battles of the American Revolution · Before: The Battle of Saratoga · Next: The Battle of Kings Mountain · Key figures: Baron von Steuben, The Marquis de Lafayette

The British leave Philadelphia

In 1778, with France now in the war, the British under Sir Henry Clinton abandoned Philadelphia and marched across New Jersey toward New York3. Washington, his army newly drilled by Baron von Steuben at Valley Forge4, moved to strike the long, strung-out column.

Black and white reproduction of a painting of officers and troops drilling in snow before a stone house
Baron von Steuben at Valley Forge, a painting by A. G. Heaton from 1907. Steuben's drill over the winter of 1777 to 1778 prepared the Continental Army for Monmouth. Public domain

Lee's bungled attack

Washington sent an advance force under Charles Lee to hit the British rear guard1. Lee's attack was poorly handled and fell apart, and his troops began retreating in confusion with the British turning on them, threatening to turn the day into a disaster.

Hand drawn 18th century battle map with hachured hills and blocks for troop positions
A manuscript map of the Battle of Monmouth drawn in 1778, with a key to the troop positions, including Charles Lee's first and later positions and Washington's dispositions. Library of Congress. Public domain

Washington rallies the line

Riding forward, Washington met the retreat, confronted Lee in an exchange later remembered as furious (modern historians think it was less dramatic), and personally rallied the troops on new ground. His presence steadied the line just as the British came on, and the battle was saved.

Valley Forge was the school; Monmouth was the examination, and the army passed.

Standing in the heat

Through a brutally hot day, in which men on both sides collapsed from the heat1, the reformed American line held against repeated British attacks and traded artillery fire. By nightfall the Americans held the field; Clinton's army slipped away in the dark to continue its march1.

Engraving of officers on horseback pointing forward over fallen soldiers and a drum
The Battle of Monmouth, New Jersey, on June 28, 1778, a 19th century engraving from the Emmet Collection of the New York Public Library showing mounted American officers amid the fighting. Public domain

Why Monmouth mattered

Monmouth settled nothing on the map, but it proved the point that mattered: the Continental Army could now stand in open battle against the best British regulars and not break. Charles Lee was court-martialled for his conduct.3 It was the last large set-piece battle between the main armies in the north, as the war's focus shifted south toward Kings Mountain and the Carolinas.

Engraving of a general on a rearing horse holding a sword, with troops in the background
Charles Lee, major general of the Continental Army, in an engraving by Johann Michael Probst published in Augsburg between 1776 and 1790. Lee was court-martialled after Monmouth. Public domain

Frequently asked questions

When and where was the Battle of Monmouth?

It was fought on 28 June 1778 at Monmouth Court House, New Jersey.

Who won the Battle of Monmouth?

The battle was tactically inconclusive, but the Americans held the field and it counts as a strategic success.

Why is Monmouth significant?

It showed that the Continental Army, retrained over the winter at Valley Forge, could stand against British regulars in open battle.

What did Charles Lee do wrong?

He mishandled the opening attack and ordered a confused retreat; Washington rallied the troops, and Lee was later court-martialled.

Why were there so many non-combat casualties?

The battle was fought in extreme heat, and many soldiers on both sides fell to heatstroke.

Sources and notes

Numbered notes in the text point to the works below.

  1. American Battlefield Trust, “Monmouth” ↩ a b c d
  2. Mark Edward Lender and Garry Wheeler Stone, Fatal Sunday: George Washington, the Monmouth Campaign, and the Politics of Battle (University of Oklahoma Press, 2016). ↩
  3. Michigan War Studies Review, “Review by Jim Piecuch of Lender and Stone, Fatal Sunday (2017-034)” ↩ a b
  4. Joseph G. Bilby and Katherine Bilby Jenkins, Monmouth Court House: The Battle That Made the American Army (Westholme Publishing, 2010). ↩
  5. Wikipedia, “Battle of Monmouth”

Rally the line at Monmouth

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