The USS Constitution vs. HMS Guerriere battle occurred on August 19, 1812, during the War of 1812, approximately 400 miles southeast of Halifax, Nova Scotia. The engagement marked a significant early naval clash between the United States and the British Empire. HMS Guerriere, detached from a previous squadron that had failed to capture USS Constitution, encountered the American frigate, confident of victory despite being outgunned and outnumbered.

The battle saw intense exchanges of broadsides between the two vessels. Constitution's superior firepower and thicker hull inflicted substantial damage on Guerriere. After a prolonged engagement, Guerriere's masts fell, rendering her helpless. Both ships attempted to board each other, but rough seas prevented successful boarding. Ultimately, Constitution continued the fight and Guerriere's foremast and mainmast also fell, leaving the British frigate incapacitated.

Captain Hull of Constitution offered assistance to Guerriere's Captain Dacres and spared him the indignity of surrendering his sword. Guerriere, beyond salvage, was set on fire and destroyed. This victory significantly boosted American morale and patriotism, despite the military insignificance of Guerriere's loss in the context of the Royal Navy's vast fleet. The battle was a pivotal moment in American naval history and fueled American pride in defeating the Royal Navy in what was perceived as a fair fight, contributing to the war effort's renewed public support. Captain Dacres was acquitted of wrongdoing, and the battle became a symbol of American resilience and naval prowess.