Letters from an American

Evacuation of Boston, 1776

15 min
Mar 17, 20262 months ago
Listen to Episode
Summary

This episode chronicles the British evacuation of Boston on March 17, 1776, a pivotal moment in the American Revolution. Through the lens of Henry Knox's journey to retrieve cannons from Fort Ticonderoga and position them at Dorchester Heights, the narrative illustrates how colonial forces successfully forced the British military to retreat, demonstrating that organized civilians could defeat professional armies.

Insights
  • Community mobilization and resource coordination across dispersed groups (militias from multiple colonies, local supporters) proved essential to military success against a professional force
  • Strategic positioning of artillery and fortifications could neutralize naval superiority and force a militarily stronger opponent to withdraw without direct confrontation
  • Personal sacrifice and unified commitment across social classes—from wealthy merchants to enslaved militiamen—created the cohesion necessary for revolutionary success
  • Logistical innovation under extreme constraints (transporting 60 tons of cannons across frozen terrain in winter) demonstrated that determination could overcome material disadvantages
  • The evacuation's success reinvigorated morale and shifted perception from survival to victory, enabling the Declaration of Independence just four months later
Trends
Decentralized coordination of military resources across autonomous regional groups achieving strategic objectivesAsymmetric warfare tactics: using fortified positions and artillery to neutralize naval and conventional military advantagesCommunity-driven logistics and supply chains leveraging local expertise and voluntary participationRapid organizational transformation from militia to trained Continental Army through structured leadership and shared purposeCross-class and cross-racial coalition building as a force multiplier in resource-constrained conflictsInformation control and fortification timing as alternatives to direct military engagementCivilian infrastructure repurposing for military advantage (timber, brush, handmade barges, sleds)Morale and narrative momentum as strategic assets in prolonged standoffs
People
Henry Knox
25-year-old Boston bookseller who became a key military strategist, designed the cannon retrieval mission, and became...
Lucy Flucker Knox
Daughter of wealthy Tories who married Henry Knox despite family opposition and chose to flee Boston with him to supp...
George Washington
Appointed General and Commander-in-Chief of Continental Army; arrived in Cambridge in July 1775 and ordered the canno...
Benedict Arnold
Connecticut military leader authorized to raise men and capture Fort Ticonderoga's cannons in May 1775
Ethan Allen
Leader of Vermont's Green Mountain Boys militia who participated in the Fort Ticonderoga capture
Thomas Gage
British General who declared Massachusetts in rebellion, offered amnesty, and warned Quebec Governor to fortify Ticon...
Sir William Howe
British military commander who arrived in Boston with 4,500 reinforcements and ordered the evacuation of British forces
John Adams
Massachusetts leader in Second Continental Congress who proposed appointing George Washington as commander-in-chief
Samuel Adams
Patriot leader excluded from British amnesty offer, making association with him a capital risk
John Hancock
Patriot leader excluded from British amnesty offer, making association with him a capital risk
King George III
British monarch who rejected the Olive Branch Petition seeking reconciliation with the colonies
Quotes
"My God, these fellows have done more work in one night than I could make my army do in three months."
General HoweUpon seeing Dorchester Heights fortifications on March 5, 1776
"They wanted to restore the traditional rights of Englishmen that were under attack in the colonies."
Heather Cox RichardsonDescribing Patriot motivations
"If the Patriots failed, association with them could mean prison or worse."
Heather Cox RichardsonDescribing the stakes of choosing sides
"What began in Boston spread across the colonies as neighbors brought their carpentry and maritime skills, cooking and medical understanding, military tactics, and endurance to the cause of liberty."
Heather Cox RichardsonDescribing how Boston's victory catalyzed broader revolutionary movement
"If they worked together, those skills would be enough to route the world's strongest military."
Heather Cox RichardsonConcluding lesson from Boston evacuation
Full Transcript
March 16, 2026. In early 1775, the people of Boston were bitterly divided. The town was on a peninsula that was almost an island, connected only by a narrow spit of land on which four horses could walk abreast at high tide. There and on the surrounding lands, Medford, Charlestown, Cambridge, Brookline, Roxbury, Dorchester Heights, Nautil Island, and Governor's Island, and in the vessels in Boston Harbor and beyond, men, women, and children were weighing their loyalties. Trouble had been brewing in the town for at least three years. On the one side were British soldiers and the loyalist subjects of the Crown called Tories. Challenging them were the civilians called Patriots. They wanted to restore the traditional rights of Englishmen that were under attack in the colonies. After the Patriots had thrown more than 300 chests of valuable tea into Boston Harbor on December 16, 1773, to protest Parliament's claim that it had the right to tax the colonists without their consent, officials from the British government had set out to make the Patriots do as they were told. They sent 10,000 soldiers and their families to Boston, where the lower class soldiers competed for housing with the locals. Sometimes soldiers deserted and took local jobs, which had grown scarce as the occupation ruined the local economy. There was little love lost between the Boston colonists and the soldiers newly arrived from England. Loyalties were less clear among the wealthier people in Boston. While poorer Patriots and soldiers jostled in the streets, British officers and loyalist Tories mingled in places like the fashionable London Bookstore on Cornhill Street. There, the young bookseller, 25-year-old Henry Knox, had on his shelves the latest volumes from the other side of the Atlantic. Knox was well read himself and was fascinated by military strategy and tactics and interest he fed through his book orders and by chatting with the soldiers who came to his shop. Knox brought his military knowledge to his support for the Patriot cause, but his political loyalties did not diminish his admiration for Lucy Flucker, the daughter of prominent and wealthy Tories, when she came with the other fashionable young women to his bookshop. She returned his admiration and the two married in June 1774, despite her parents' objection to Henry due to his politics. Her parents reluctantly allowed their daughter to marry, but disowned her of her inheritance. The battles of Lexington and Concord on April 19, 1775 meant that Bostonians could no longer be neutral in the growing tension between the Tories and the Patriots. They would have to choose where their loyalties lay, with the Patriots trying to protect their traditional rights, or with the Tories claiming the king had new, radical powers that overrode the rights of Englishmen. Even before the British soldiers made it back down the battle road from Concord on April 19, militiamen, both white and black, free and enslaved from the Massachusetts countryside, furious that soldiers of their own government had shot at them and killed their neighbors, rushed to surround Boston, laying siege to the soldiers and British officials there. Townspeople, like Henry and Lucy Knox, had to decide where to place their loyalties. It was not an easy question. In May, the Second Continental Congress sent the Olive Branch petition asking King George for reconciliation, a petition the king rejected, and in June, British General Thomas Gage declared Massachusetts to be in a state of rebellion, but offered amnesty for all who would lay down their arms, except for Patriot leaders Samuel Adams and John Hancock. If the Patriots failed, association with them could mean prison or worse. With his ties to the town's Tories, including his wife's family and knowledge of artillery, Knox could have found a position with the British. Instead, he chose the Patriots. He escaped Boston to join the men besieging the town, helping his comrades build fortifications around the city. Lucy chose to flee with him, leaving her family behind. While Henry camped near Boston, Lucy moved around, alone and unsettled, from the homes of friends to rented rooms in Worcester. The standoff in Boston began to force others to take a stand as well. Everyone knew that Fort Ticonderoga, 300 miles away near the confluence of Lake Champlain and Lake George in New York, was fortified with heavy cannons that could make or break a battle, and that they were guarded by only a small detachment of two officers and 48 men, most of whom were unfit for regular military service. In May 1775, British General Thomas Gage warned the Governor of Quebec he must fortify the Ticonderoga Fort. At about the same time, the Massachusetts Provincial Congress authorized Benedict Arnold of Connecticut to raise men to capture the cannons. Arnold knew that area well, and he and his men set out. Connecticut also raised militiamen to seize the fort, and Vermont's Green Mountain boys, led by Ethan Allen, were already on their way. The forces came together and worked their way through the woods to the fort. At dawn on May 10, nine days before the Governor of Quebec received Gage's letter, the Patriots captured Fort Ticonderoga in a surprise attack that found the defenders asleep in their beds. The Patriots seized more than 180 cannons and other weapons. While the militiamen repaired and strengthened the fort, lines around Boston were hardening. From England, military reinforcements of 4,500 men led by three new commanders, including Sir William Howe, arrived in Boston. Because ships of the British navy and Tory allies controlled the harbor, protecting the soldiers in the town and bringing in supplies, the Patriots could not advance. But neither could the British officials. British soldiers seized Charlestown at the Battle of Bunker Hill on June 17, but their victory did not settle anything. The British took heavy casualties and did not break the Patriots' lines, teaching the Patriots that they could hold off the British army. The leaders of the Second Continental Congress in Philadelphia recognized the importance of events in Boston. They took control of the forces surrounding the town and created the Continental Army. Recognizing that the Patriots' reputation for radicalism worried tentative supporters, Massachusetts leader John Adams proposed appointing George Washington of Virginia, general and commander-in-chief. Washington arrived at Cambridge to take command in July. He and Henry Knox became fast friends as the two sides in and around Boston settled down into local skirmishes. As the British restricted guns in the town, most Patriots left, joining the Continental Army growing outside the town. Riflemen and militias arrived from Virginia, Maryland, Pennsylvania and New Jersey, as well as the New England colonies, Rhode Island, New Hampshire, Connecticut, and the Green Mountains. Continental soldiers dug trenches and drilled, turning from militia into trained soldiers. At the same time, loyalists from the countryside took refuge in the city, where people went without food or wood for cooking and heating, and horses grew gaunt without enough hay. But because the British could bring in supplies over water, the town held on. By fall, it was not at all clear that the Patriot cause would survive. The Patriots had allies in the fishermen who harassed British shipping. But while shortages squeezed Boston's inhabitants, the British soldiers had dug in. There was no sign they could be dislodged, and the enlistments of the colonial soldiers would expire at the end of the year. If the Patriots couldn't rid Boston of the British soldiers and their Tory allies, the revolution might well die in its cradle. Knox had developed a plan to retrieve the cannons from Fort Ticonderoga, and in November, Washington ordered him to go ahead. Knox made the trip quickly, arriving on December 5th at Ticonderoga, where he selected 59 cannons, mortars, and howitzers to transport back to Boston. Some of the cannons weighed more than 5,000 pounds each, and together they weighed about 60 tons. Knox's men loaded the weaponry on handmade barges to cross 32 miles of Lake George before it turned to ice. Then carpenters on Knox's crew built 42 exceeding strong sleds. Knox rented horses to drag the sleds, laden with artillery, to Albany. Snow made it easier to move the cannons across the land, but the ice on the rivers was so thin the sleds crashed through it twice. The men recovered all but one of the weapons from the icy water, helped by locals who supported the cause. What Knox called a noble train of artillery continued into Massachusetts and crossed over the Berkshires into the Connecticut River Valley and on to Worcester, where Henry got to see Lucy. Finally, after 10 grueling weeks on January 25th, John Adams reported seeing the cannons pass through Framingham, where they were outfitted for new service. In early March, Knox delivered the cannons to Washington in Cambridge. Washington placed some of the cannons at Leachmere's Point and at High Points in Cambridge and Roxbury to fire on the town, while the Patriots moved the rest of the cannons to Dorchester Heights. From there, Continental soldiers could threaten not only the soldiers in the Tory town, but also, at last, the warships in Boston Harbor. On March 2nd, 3rd, and 4th, the British soldiers and Washington's men traded fire as Continental soldiers built defenses out of timber and brush out of sight of British spyglasses. And then, on the night of March 5th, under cover of darkness, the Patriots moved their guns and defenses into position on Dorchester Heights. My God, General House said when he saw the fortifications, these fellows have done more work in one night than I could make my army do in three months. The British shot at the defenses, but their shot fell short. Remaining loyalists in the town wrote a letter to Washington, promising him that the British would not burn the town if the Patriots would let them leave unmolested. Washington agreed. General House ordered the soldiers to torch the town if anyone disturbed their departure. On March 10th, he began to load the British ships with soldiers and the loyalists who wanted to go with them, including Lucy Knox's parents, who would never see their daughter again. For a week, March winds battered at the loaded ships, keeping them trapped in the harbor. Finally, at 4 a.m. on March 17th, 120 ships carrying more than 10,000 soldiers and more than 1,000 Tories weighed anchor and left Boston. That evacuation, 250 years ago tomorrow, was a major victory for Washington and the Continental Soldiers, illustrating that a rag tag bunch of countrymen and women working together could beat the military might of the British Army and Navy when it turned against its own people. Watching the British retreat reinvigorated the Patriots after a discouraging winter and gave them confidence that their determination to protect their rights was not only a just cause, but a winning one. The ship sailing out of Boston Harbor helped solidify that message. They carried the town's Tories with them, enabling the Patriots to strengthen their community and spread their principles of independence to previously unaligned neighbors without either British officials or reactionary neighbors silencing them. What began in Boston spread across the colonies as neighbors brought their carpentry and maritime skills, cooking and medical understanding, military tactics, and endurance to the cause of liberty. The evacuation of Boston had taught them that if they worked together, those skills would be enough to route the world's strongest military. Less than four months after the British ships left Boston Harbor, the Patriots took the extraordinarily daring step of declaring independence from the King. They signed a document pledging to each other that they would dedicate their lives, their fortunes, and their sacred honor to creating a brand new nation. Letters from an American was written and read by Heather Cox Richardson. It was produced at Soundscape Productions, dead in Massachusetts, recorded with music composed by Michael Moss.