The incident was the climax of growing unrest in Boston, fueled by colonists’ opposition to a series of acts passed by the British Parliament. Especially unpopular was an act that raised revenue through duties on lead, glass, paper, paint, and tea. On March 5, 1770, a crowd confronted eight British soldiers in the streets of the city. As the mob insulted and threatened them, the soldiers fired their muskets, killing five colonists.