I would suggest that the minutemen's attempts were a success in so far as they signaled the start of open conflict. It was at this moment that the colonists understood the need to form an army, develop a plan of attack, name a general, and start to act like a government and nation. The attempts of the Massachusetts militia started that. Regardless of other consequences, the fact that the American Revolution seemed to formally advance after this would suggest that their attempts were successful.
I assume you're referring to the events that happened as the British Army returned to Boston after the Battles of Lexington and Concord in April 1775.
What the townspeople, and the minutemen and Patriots in general did was a sort of hit-and-run warfare. They hid behind bushes and stone walls and shot at the British as they marched along the road. This was not in keeping with the usual European tactics, which were to have masses of soldiers meet head-on on open fields.
The tactics were a success in that they harassed the British all the way back to Boston. During this time 73 British were killed, 174 wounded and 28 went missing.
This is from the book called April Morning by Howard Fast and the book is divided into section and this question is from the section called "The Midday" thank you soo much for all your help! :)