The British marched from Boston to Conccord and Lexington to arrest the militia and collect any weapons that were stolen from them. The "shot heard round the world" was the ticket to starting the Revolutionary War.
A militia set up on Breeds Hill Massachusetts outside of Boston. William Prescott who is leading the Militia orders not to fire until you see the whites of their eyes. The battle results in 40% casualties for the British. This win is a major confidence boost for colonists.
George Washington plans a surprise attack against the Hessians the day after Christmas in Trenton because they would still be drunk and hungover unfit to fight. With this plan, the Americans were able to capture 800 Hessians with one loss.