Fort McHenry: The Battle That Gave America Its Anthem

On the night of 13 September 1814, British warships anchored in the Patapsco River opened fire on a small American fort guarding the approaches to Baltimore. For the next 25 hours, bombs, shells and Congreve rockets fell on Fort McHenry. The defenders could do little in response. Much of the British fleet remained beyond the effective range of the fort’s guns, leaving the American garrison in the uncomfortable position of having to endure a bombardment it could barely answer. Yet when morning came, the fort was still in American hands.

The failure to reduce Fort McHenry to rubble helped bring Britain’s campaign against Baltimore to an end. But the battle acquired a significance far beyond its immediate military consequences as watching from a ship in the harbour was an American lawyer named Francis Scott Key. At dawn, he saw an American flag still flying above the fort. The sight inspired him to write a poem. Its opening words would eventually become the national anthem of the United States.

Background: The War of 1812

The battle was part of the wider War of 1812 between the United States and Britain. The causes of the conflict were complex. American grievances included British restrictions on neutral trade during the Napoleonic Wars, the impressment of sailors from American vessels into the Royal Navy, and British support for Native American resistance to American expansion.

For Britain, however, the conflict initially remained secondary to the far greater struggle against Napoleon Bonaparte in Europe. British resources were concentrated on defeating France, while much of the fighting in North America took place along the Canadian frontier and around the Great Lakes. That changed dramatically in 1814.

Napoleon abdicated in April, temporarily ended the European war, allowing Britain to redirect experienced troops and naval resources towards North America. The Americans were about to face a much more dangerous enemy.

British commanders planned a series of offensives designed to place pressure on the United States from several directions. One force advanced through northern New York. Another operated in the Chesapeake.

The latter campaign produced one of the most humiliating episodes in early American history. On 24 August 1814, British troops defeated an American force at Bladensburg and entered Washington. They burned the Capitol, the President’s House and other public buildings. The psychological impact was enormous. The British then turned their attention towards a more important military and commercial target, Baltimore.

Why Baltimore mattered

Baltimore was one of the largest cities in the United States and an important centre of maritime trade. It was also home to American privateers. These privately owned vessels operated under government authority to attack enemy shipping, and Baltimore’s fast schooners had become a persistent irritation to British commerce.

To British commanders, the city was therefore more than simply another coastal target. Destroying its harbour and privateering infrastructure would deliver both a military and an economic blow, but Baltimore was better prepared than Washington had been.

The city’s approaches had been fortified and thousands of militia assembled for its defence. Most importantly, any British fleet attempting to enter Baltimore’s inner harbour would first have to pass Fort McHenry.

The setting

Fort McHenry stood on Whetstone Point, commanding the entrance to Baltimore’s harbour. British warships could enter the Patapsco River, but to move into the inner harbour and support an attack on the city they would have to neutralise the fort and the surrounding American defences.

The fort itself was a five-pointed masonry and earthwork structure surrounded by a dry moat. Its commander was Major George Armistead, and he had been preparing for precisely this moment. The fort had been strengthened, additional guns installed, and approximately 1,000 soldiers, sailors and militiamen assembled for its defence.

In 1813, Armistead had commissioned Baltimore flagmaker, Mary Pickersgill, to produce an enormous American flag. It measured approximately 30 by 42 feet. Armistead reportedly wanted a flag so large that the British would have no difficulty seeing it from a distance. The decision would have consequences he could never have imagined.

The Principal Commanders

Vice-Admiral Sir Alexander Cochrane

Cochrane commanded British naval operations in the Chesapeake. An experienced Royal Navy officer, he had served during the American Revolutionary and Napoleonic Wars and now controlled a formidable naval force capable of striking almost anywhere along the American coastline.

His ships carried conventional naval artillery as well as specialised weapons particularly suited to attacking fixed positions. Among them were bomb vessels equipped with heavy mortars capable of firing explosive shells in high arcs over fortifications. The fleet also carried Congreve rockets. They were inaccurate, but frightening weapons.

Major George Armistead

The 34-year-old Armistead commanded Fort McHenry. He understood that the survival of the fort depended less upon defeating the Royal Navy in an artillery duel than simply remaining operational. The British could choose their range. Armistead could not. His task was therefore brutally straightforward: keep the garrison together, preserve the fort’s guns and prevent the British from forcing their way into Baltimore harbour.

Major-General Robert Ross

The naval bombardment was only one part of the British attack. Major-General Robert Ross commanded the land force. Ross was an experienced combat commander who had fought in the Peninsular War and had led the British troops that defeated the Americans at Bladensburg and captured Washington.

His plan was to approach Baltimore from the east while Cochrane’s fleet attacked from the water. However, before the main assault on Baltimore could begin, Ross was shot during a skirmish with American troops on 12 September. He died shortly afterwards. Command passed to Colonel Arthur Brooke.

The loss of Ross deprived the British army of an experienced and aggressive commander at a critical moment.

The British plan

The attack on Baltimore was a combined operation. British troops would land at North Point and advance towards the city from the east. At the same time, the Royal Navy would move up the Patapsco River, destroy Fort McHenry and penetrate Baltimore harbour. If successful, the fleet could bombard the city, land additional troops and threaten the American defenders from the rear. The concept was sound but it depended upon the two elements supporting each other.

The land force encountered determined American resistance and increasingly formidable defensive positions around Baltimore. The naval force therefore needed to break through, but Fort McHenry stood in its way.

The bombardment begins

At approximately 6:30 on the morning of 13 September, the British opened fire. Bomb vessels began launching heavy mortar shells towards Fort McHenry. Congreve rockets streaked through the sky. The bombardment continued throughout the day. The British Bombardment Fleet consisted of the following vessels:

Frigates: HMS Surprise, Euryalus, Havannah, Hebrus, Madagascar, Seahorse and Severn

Brig-sloops: HMS Fairy, Rover and Wolverine

Schooner: HMS Cockschafer

Bomb vessels: HMS Aetna, Devastation, Meteor, Terror and Volcano

Rocket vessel: HMS Erebus

For the defenders, the situation was deeply frustrating. The British ships were positioned largely beyond the effective range of the fort’s artillery. American guns returned fire, but many of their rounds fell short.

The British possessed the initiative. They could bombard the fort while remaining relatively safe from its guns. Yet this apparent advantage concealed a fundamental problem. Bombardment alone could only achieve the British objective if it either destroyed the fort’s defences or broke the morale of its garrison. Neither happened.

When British vessels moved closer during the afternoon, American artillery demonstrated that the fort remained dangerous. The ships were forced to withdraw again to longer range. The bombardment continued.

“The rockets’ red glare”

The weather deteriorated as the battle continued. Rain fell heavily over Baltimore. Through the afternoon, evening and night, British shells continued to arc towards the fort. The mortars fired large explosive bombs designed to burst above or inside the defences, showering the area with fragments. Congreve rockets followed unpredictable trajectories through the darkness.

For men inside Fort McHenry, there was often little to do except wait. They could hear the British weapons being fired. Then came the pause. Then the impact. Some shells exploded. Others buried themselves in the ground without detonating.

Despite the extraordinary volume of fire, the fort’s casualties remained surprisingly low. More importantly, its garrison did not break.

Francis Scott Key

Several miles away, Francis Scott Key watched the bombardment. Key was a 35-year-old American lawyer who had travelled under a flag of truce to negotiate the release of Dr William Beanes, an American physician detained by the British. The mission succeeded. But Key and his companions had heard British plans concerning the attack on Baltimore and were therefore prevented from returning to shore until the operation had finished.

They remained aboard an American truce vessel under British supervision. From there, Key watched the bombardment. During daylight he could see the fort. At night its survival could only be inferred from the continuing exchange of fire.

Every British rocket and exploding shell briefly illuminated the darkness. Paradoxically, the weapons intended to destroy the fort provided evidence that it was still resisting. If the bombardment continued, the fort had presumably not surrendered. Key later transformed those images into some of the most famous words in American history.

The attack in darkness

The British made another attempt during the night. Small boats carrying sailors and marines moved towards the western side of the harbour, apparently hoping to distract the defenders and perhaps find a way around the main American positions. But the Americans detected the movement. Guns from Fort McHenry and nearby batteries opened fire. The attempt failed.

The British faced an increasingly uncomfortable reality. The fort remained intact. The harbour remained blocked. And the army outside Baltimore was confronting extensive American defensive works without the naval support upon which the operation depended. The combined attack was beginning to unravel.

By the Dawn's Early Light

By the morning of 14 September, the British bombardment had failed. After approximately 25 hours, Cochrane ordered his ships to withdraw. The fort had survived.

As daylight returned, an enormous American flag was raised above Fort McHenry. It was Mary Pickersgill’s garrison flag. From his position downriver, Francis Scott Key saw it. The British fleet was withdrawing. Baltimore had not fallen.

Key began writing verses describing what he had witnessed. The poem was initially titled Defence of Fort M’Henry. It was soon set to the melody of a popular song and became known by the words of its opening stanza: The Star-Spangled Banner.

More than a century later, in 1931, it became the national anthem of the United States.

Why the British attack failed

Fort McHenry survived for several reasons. The first was geography. The British fleet could bombard the fort from long range, but destroying it was another matter. The same distance that protected British ships from American cannon also reduced the accuracy and effectiveness of British fire.

Bomb vessels were capable of throwing enormous explosive shells over considerable distances, but early nineteenth-century artillery was not precision weaponry. The British could saturate an area. They could not reliably demolish individual defensive positions from miles away.

The fort had been prepared. Earthworks absorbed explosive force far more effectively than exposed buildings or ships. Armistead’s garrison had strengthened its positions and was able to shelter from much of the bombardment.

Morale held. This was perhaps the decisive factor. The British did not necessarily need to physically destroy Fort McHenry. If its defenders had abandoned their positions or surrendered, the result would have been the same. They did neither.

Finally, the British operation depended upon coordination between land and naval forces. Once the fleet proved unable to force the harbour and the American land defences appeared increasingly formidable, the logic of continuing the attack disappeared. Baltimore was not worth a costly frontal assault without naval support.

Strategic outcome

The defence of Fort McHenry did not end the War of 1812. Nor was the battle, in isolation, a catastrophic British military defeat. The Royal Navy remained overwhelmingly superior at sea, and the British force withdrew largely intact, but Baltimore mattered.

Coming only weeks after the burning of Washington, another major American defeat would have had serious psychological and political consequences. Instead, the United States had successfully defended one of its most important cities. Elsewhere, British operations were also encountering setbacks. An invasion from Canada had been checked at Plattsburgh. Both governments were already negotiating in Europe.

On 24 December 1814, Britain and the United States signed the Treaty of Ghent. The war formally ended. Ironically, because news travelled slowly across the Atlantic, one of its most famous battles was still to come. On 8 January 1815, Andrew Jackson defeated a British army outside New Orleans, unaware that the peace treaty had already been signed.

The flag

The flag raised above Fort McHenry became one of the most important artefacts in American history. Mary Pickersgill had made it in Baltimore in 1813 with the assistance of several young women, including her daughter Caroline, her nieces and Grace Wisher, a young African American indentured servant.

The original flag contained fifteen stars and fifteen stripes, representing the fifteen states then in the Union. It remained in the possession of the Armistead family for much of the nineteenth century. Eventually, it was entrusted to the Smithsonian Institution.

Today, the surviving Star-Spangled Banner is preserved at the National Museum of American History in Washington, D.C. It is an extraordinary physical connection to the battle. The flag seen by Francis Scott Key on the morning of 14 September 1814 still exists.

The enduring lesson

Fort McHenry is remembered principally because it produced the words of the American national anthem. But that can obscure the military lesson of the battle. The defenders did not need to destroy the British fleet. They did not even need to win the artillery duel. They simply had to remain.

Armistead’s strategic task was to deny the British access to Baltimore harbour. As long as Fort McHenry continued to function, it achieved that purpose. The British possessed greater naval power, longer-ranged weapons and the ability to determine much of the tempo of the engagement. Yet none of those advantages mattered if they could not achieve the operational objective. That distinction between destruction and denial remains fundamental to warfare.

A defending force does not always have to defeat a stronger attacker. Sometimes it merely has to make the attack too difficult, too costly or too uncertain to continue.

When morning came, the flag above its ramparts transformed a successful defensive action into something much larger: a national story of survival that Americans would still be singing more than two centuries later.