On the night of April 18th the British troops of General Gage embarked on a march towards Lexington, Massachusetts. With 700 mixed troops Lt. Colonel Francis Smith started his long midnight march in search of military supplies being hidden by the colonials. Yes, tis the night Paul Revere and William Dawes made their famous ride informing the country side "the Regulars are out, the Regulars are out!" In addition to calling out the militia Revere's assignment was to warn Samuel Adams and John Hancock in Lexington. The military supplies once stored in Concord had since been moved and were safe from the British.
Who actually fired the first shot on the town green of Lexington that foggy morning I don't think will ever be known. Historians have been debating this from every angle since April 20th, 1775. Needles to say this event was the first military battle of the American Revolution. 
I do believe that if we had more green lego pieces the war would have been over in less than a year.
