fighting began in massachusetts when british troops…?

Answer:
April 1775, It all started when the british confiscated the colonial weapons and then the British ran into an army militia.
Explanation: They took their weapons.
Answer:
British troops began to occupy Boston to enforce the British laws.
Explanation:
This answer is based on an assumption that we are discussing the incidents that preceded the Revolutionary War. Due to the colonies' dissatisfaction with the increased taxes and other paraphernalia such as the Stamp Act. The colonists became indignant at the unfair treatment, especially having been guaranteed that they would maintain equal rights along with their compatriots overseas. Tensions built up to the point that skirmishes occurred more and more frequently, the highlight of which is the Boston Massacre.