On Friday, the 2d instant, a quarrel arose between some soldiers of the 29th, and the rope makers journeymen and apprentices, which was carried to that length, as to become dangerous to the lives of each party, many of them being much wounded. This contentious disposition continued until the Monday evening following, [March 5th] when a party of seven or eight soldiers were detached from the main guard, under the command of Captain Preston, and by his orders fired upon the inhabitants promiscuously in King Street, without the least warning of their intention, and killed three on the spot; another has since died of his wounds, and others are dangerously, some it is feared mortally, wounded. Captain Preston and his party are now in jail. An inquiry is now making into this unhappy affair . . . Sam Adams, John Hancock, and others, Committee of the Town of Boston

What happened on March 2nd that may have angered Bostonians?