Over the night and the following day of April 18-19, 1775, individual British soldiers marched 36 miles or more, on the round-trip expedition from Boston. Following the early morning battles at Lexington and Concord, armed colonial militia from as far away as Worcester swarmed over the column, forcing the regulars into a fighting retreat.
In those days, Boston was a virtual island, connected to the mainland by a narrow “neck” of land. More than 20,000 armed men converged from all over New England in the weeks that followed, gathering in buildings and encampments from Cambridge to Roxbury.
A man who should have gone into history among the top tier of American Founding Fathers, the future turncoat Benedict Arnold, arrived with Connecticut militia to support the siege. Arnold informed the Massachusetts Committee of Safety that Fort Ticonderoga, located along the southern end of Lake Champlain in northern New York, was bristling with cannon and other military stores. Furthermore, the place was lightly defended.
The committee commissioned Arnold a colonel on May 3, authorizing him to raise troops and lead a mission to capture the fort. Seven days later, Colonel Arnold and militia forces from Connecticut and western Massachusetts in conjunction with Ethan Allen and his “Green Mountain Boys” captured the fort, and all its armaments.
The Continental Congress created the Army that June, appointing General George Washington to lead it. When General Washington took command of that army in July, it was a force with an average of nine rounds-worth of shot and powder, per man. British forces occupying Boston, were effectively penned up by forces too weak to do anything about it.
The stalemate dragged on for months, when a 25-year-old bookseller came to General Washington with a plan. His name was Henry Knox. His plan was a 300-mile, round trip slog into a New England winter, to retrieve the guns of Ticonderoga: brass and iron cannon, howitzers, and mortars. 59 pieces in all. Washington’s advisors derided the idea as hopeless, but the General approved.
Knox set out with a column of men in late November, 1775. For nearly two months, he and his team wrestled 60 tons of cannons and other armaments by boat, animal & man-hauled sledges along roads little better than foot trails. Across two barely frozen rivers, and through the forests and swamps of the Berkshires to Cambridge, historian Victor Brooks called it “one of the most stupendous feats of logistics” of the Revolution. It must have been a sight on January 24, 1776, when Knox returned at the head of that “Noble Train of Artillery”.
For British military leadership in Boston, headed by General William Howe, the only option for resupply was by water, via Boston Harbor. Both sides of the siege understood the strategic importance of the twin prominences overlooking the harbor, the hills of Charlestown to the north, and Dorchester heights to the south. It’s why British forces had nearly spent themselves on Farmer Breed’s hillside that June, an engagement that went into history as the Battle of Bunker Hill.
With Howe’s forces in possession of the Charlestown peninsula, Washington had long considered occupying Dorchester Heights, but considered his forces too weak. That changed with the guns of Ticonderoga.
In the first days of March, Washington placed several heavy cannon at Lechmere’s Point and Cobble Hill in Cambridge, and on Lamb’s Dam in Roxbury. The batteries opened fire on the night of March 2, and again on the following night and the night after that. With British attention thus diverted, American General John Thomas and a force of some 2,000 made plans to take the heights.
As the ground was frozen and digging impossible, fortifications and cannon placements were fashioned from heavy 10′ timbers. With the path to the top lined with hay bales to muffle their sounds, these fortifications were manhandled to the top of Dorchester heights over the night of March 4-5, along with the bulk of Knox’ cannons.
General Howe was stunned on awakening, on the morning of March 5. The British garrison in Boston and the fleet in harbor, were now under the muzzles of Patriot guns. “The rebels have done more in one night”, he said, “than my whole army would have done in a month.”
Plans were laid for an immediate British assault on the hill, as reinforcements poured into the position. By day’s end, Howe faced the prospect of another bunker Hill, this time against a force of 6,000 in possession of heavy artillery.
A heavy snowstorm descended late in the day, interrupting Howe’s plan for the assault. A few days later, he had thought better of it. A tacit cease-fire settled in over the next two weeks, with Washington’s side declining to open fire, and Howe’s side refraining from destroying the town, in the course of withdrawing from Boston.
British forces departed Boston by sea on March 17 with about 1,000 civilian loyalists, resulting in a peculiar Massachusetts institution which exists to this day. “Evacuation Day”:
It’s doubtful whether Washington possessed either powder or shot for a sustained campaign, but British forces occupying Boston didn’t know that. The mere presence of those guns moved General Howe to weigh anchor and sail for Nova Scotia. The episode may be the greatest head fake, in military history.
In those days, Boston was a virtual island, connected to the mainland by a narrow “neck” of land. More than 20,000 armed men converged from all over New England in the weeks that followed, gathering in buildings and encampments from Cambridge to Roxbury.
Historical Easter Eggs - Today in History 
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