What lead up to the battle of Lexington and Concord?
Starting in 1764, Great Britain enacted a series of measures aimed at raising revenue from its 13 American colonies. Many of those measures, including the Sugar Act, Stamp Act, and Townshend Acts, generated fierce resentment among the colonists, who protested against “taxation without representation.” Boston, the site of the 1770 Boston Massacure and the 1773 Boston Tea party, was one of the main points of resistance. King George III of Britain ramped up the military presence there, and in June 1774 he shut down the city’s harbor until colonists paid for tea dumped overboard the previous year. Soon after, the British Parliament declared that Massachusetts was in open rebellion.
Who fired the first shot that started the battle and what was it called?
No one is actually sure who fired the first shot or if it was an American or British soldier. It was called the "shot heard around the world".
Why was the battle so important?
Because it's where the American Revolutionary war started.
What happened when the British arrived?
When the British arrived, there were only around 80 American militiamen in the town. They were led by Captain John Parker. They were up against a much larger British force led by Major John Pitcairn. Neither side expected to actually fight, but in the midst of the confusion a gunshot went off forcing the British to attack. Some of the colonists were killed and the rest fled.