25 Hours That Shook America: The Siege of Fort McHenry
The Siege of Fort McHenry, fought September 13 to 14, 1814, during the War of 1812, was one of the most decisive fort engagements in American history. The fort, located in Baltimore Harbor, Maryland, defended the city against a British force that had burned Washington, D.C., a month earlier. Fort McHenry was a five pointed star shaped masonry and earth fort, housing about 1,000 American defenders under Major George Armistead. Its artillery included over 150 guns, ranging from 42 pounder long guns to 6 pounders, positioned to cover the harbor channels.
The British expeditionary force, led by Vice Admiral Sir Alexander Cochrane and Major General Robert Ross, included 4,000 troops and a naval squadron of 30 warships carrying over 1,000 cannons. The siege began with a continuous bombardment that lasted 25 hours, the longest in United States history. The British fired around 1,500 shells and rockets at the fort. Thick earthworks absorbed much of the damage, leaving minor breaches. American gunners returned fire continuously, targeting ships at up to 1,500 yards, showing accuracy and discipline under pressure.
American casualties were low considering the scale, with about four dead and 24 wounded. British crews suffered higher losses from counterfire and rough seas. The fort’s defenders prevented a landing of British troops, forcing the attackers to retreat. At dawn, the large American flag still flew over the fort, inspiring Francis Scott Key to write the poem that became the U.S. national anthem.
The siege demonstrated the value of well placed fortifications and disciplined artillery. British commanders underestimated the range and resilience of American guns. Accurate return fire disrupted their coordination. Fort McHenry’s defense became a symbol of national resilience, showing how smaller forces could repel superior numbers through fort design, artillery placement, and morale.
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