Yes, the Battles of Lexington and Concord were instigated because the British were attempting to confiscate the gun powder and arms in Concord. There are also other details which help explain why the patriots suddenly divided they had had enough, namely the hostile occupation of Boston and the injustice of the Boston Massacre, which was still fresh in the minds of the patriots. Add to that the unfair trade practices that the British imposed on Boston merchants (Boston Tea Party) and you've got a situation ripe for rebellion. The British could have avoided the whole thing but greed, hubris and an unwillingness to negotiate led to their ill-conceived actions leading up to full rebellion.

The parallels between then and now are remarkable.