Amid tense relations between the civilians and the soldiers, a mob formed around a British sentry and verbally abused him. He was eventually supported by seven additional soldiers, led by Captain Thomas Preston, who were hit by clubs, stones, and snowballs. Eventually, one soldier fired, prompting the others to fire without an order by Preston. The gunfire instantly killed three people and wounded eight others, two of whom later died of their wounds.^[6]

The crowd eventually dispersed after Acting Governor Thomas Hutchinson promised an inquiry, but they re-formed the next day, prompting the withdrawal of the troops to Castle Island. Eight soldiers, one officer, and four civilians were arrested and charged with murder, and they were defended by future U.S. President John Adams. Six of the soldiers were acquitted; the other two were convicted of manslaughter and given reduced sentences. The two found guilty of manslaughter were sentenced to branding on their hand.

Depictions, reports, and propaganda about the event heightened tensions throughout the Thirteen Colonies, notably the colored engraving produced by Paul Revere