January 1776 was a dark and scary time in Boston. By this time, the city had been on a wartime footing for nine months following the battles at Lexington and Concord the preceding April. The redcoats had transformed the city into an armed garrison, but they were outnumbered and cut off by the patriots who surrounded them in Roxbury and Cambridge. The Americans had the numbers, but the British had artillery regiments and the guns of the Royal Navy to dissuade a frontal assault on the city. Those Navy ships were a lifeline for the British troops, bringing in enough food and supplies to keep them alive, but only barely. Even though many residents had fled the town, leaving mostly loyalists behind, there was not enough food or firewood to go around. Things weren’t much better on the other side of the lines. The patriots had enough to eat, though they were usually gouged on the prices that winter. But they were spending the winter shivering in hastily-built barracks with no insulation and little firewood. They must have watched with some jealousy as the redcoats across the river tore down the meetinghouse in North Square to use the timber as firewood. On January 24, George Washington seethed in a letter to John Hancock, “no man upon Earth wishes more ardently to destroy the Nest in Boston, than I do—no person would be willing to goe greater lengths than I shall to accomplish It, If it shall be thought advisable—But If we have neither Powder to Bombard with, nor Ice to pass on, we shall be in no better situation than we have been in all the year.” Little did the general know that Boston’s salvation was just a day away. The next day, 25-year-old Henry Knox arrived in Cambridge with 60 tons of artillery in tow. Against all odds, he had managed to float, cart, and sled 59 cannons and mortars from Fort Ticonderoga, on the icy shores of Lake Champlain in upstate New York, over the Berkshire mountains, to the Continental headquarters in Cambridge. This week, we are going to revisit an interview that first aired in May 2020 with author William Hazelgrove about his book Henry Knox’s Noble Train and the audacious expedition that saved Boston 250 years ago this week.