How did henry knox general washington recapture boston after the battle of bunker hill?

After the battle of Bunker Hill, Henry Knox was able to help General Washington by coming up with a plan to transfer the guns from Ticonderoga into Boston. Knox gained Washington's favor and was promoted to being a colonel general. By December 1775, Knox was able to bring him 69 guns and ammunition for the troops. This was a crucial step taken towards gaining back Boston from the British.  

He would most likely post his laws in the city market