The Battle of Monmouth was an inconclusive battle of the American Revolutionary War fought on June 28, 1778. The main American Continental Army under George Washington attacked the rear of the British Army's column led by Sir Henry Clinton as they left Monmouth Court House (modern Freehold, New Jersey).

American General Charles Lee led the advance and initiated the first attack on the column's rear. When the British turned to flank him, he ordered a general retreat, which soon became disorganized. Washington argued with Lee, then personally rallied the troops and repelled two counterattacks. On a very hot day, the battle was a standoff. Both sides lost as many men to sunstroke as to the enemy. British losses were 103 dead and 161 wounded, while the Americans lost 147 dead and 170 wounded. Both sides retired at nightfall.

The battle was the last major engagement of the northern theatre, and the largest one-day battle of the war when measured in terms of participants. Lee was later court-martialed for his actions.

Molly Pitcher became famous for helping to work a cannon during the battle.