Why battle of Lexington and Concord are very Important for the colonies?

This was the official start of the Revolutionary war. British soldiers marched to Concord in order to seize arms cache from the colonists. The British were mad because of all the stuff the colonists had started. So, the king listened to the soldiers and decided the best way to get weapons and get back at the colonists was to destroy and take their supplies. After the Indian and French war the British were very low in supplies and couldn't afford to get more weapons. The cause of all this mess was because the King labelled the colonists as rebels because of all their defiance against taxes and such. At the end of the war the colonists won and proved their strength to everyone.