How did Henry Knox drive the British out of Boston

In November, Henry Knox suggested to George Washington that they drag 59 cannons, captured at Fort Ticonderoga the previous spring, over 300 miles to Boston to bolster its defenses and drive the British out. Knox arranged for the cannons to be dragged from the fort to Boston on heavy sleds over the snow and ice and after 56 days, the cannons finally arrived outside Boston on January 25, 1776. He used 40 sleds and 80 yoke of oxen to transport them over the ice and snow. He arrived at Ticonderoga four days later. After many setbacks, on the night of March 4th, Washington's gun batteries in Cambridge distracted British troops while several thousand Americans quietly maneuvered the artillery up Dorchester Heights and frantically constructed emplacements. Logs painted to look like cannon made it seem as if they had even more firepower than they did. The next morning an astonished British General Howe looked up at Dorchester Heights and remarked, "The rebels did more in one night than my whole army would have done in one month." Thanks largely to Henry Knox, the vaunted British Army had little chance of ending the siege of Boston. On March 17th, British troops and Tory sympathizers began the evacuation of Boston.

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Explanation:

a memoir is the correct answer

if i am correct the answer is going to be a) the federal program of reconstruction ended.