Patriots' Day (officially Patriots' Day in Massachusetts[1] and Patriot's Day in Maine[2]) is a civic holiday commemorating the anniversary of the Battles of Lexington and Concord on April 19, 1775. These were the first battles of the American Revolutionary War. It is observed on the third Monday in April in Massachusetts[3] and Maine[4] (once part of Massachusetts), and is a public school observance day in Wisconsin[5]. Florida law also encourages people to celebrate it, though it is not treated as a public holiday.[6] Observances and re-enactments of these first battles of the American Revolution occur annually at Lexington Green in Lexington, Massachusetts, (around 6:00 am) and The Old North Bridge in Concord, Massachusetts, (around 9:00 am). In the morning, mounted re-enactors (National Lancers - Massachusetts) with state police escorts retrace the rides of Paul Revere and William Dawes, calling out warnings the whole way.