Spring is a time of rebirth, and with the melting of snow we begin to think about the blooming of flowers and the budding of trees as nature reawakens after her winter slumber. But in Concord, the arrival of spring brings to mind more warlike notions, and the sights and sounds of marching redcoats and militiamen fill the town as Concord commemorates the April 19, 1775, Battles of Lexington and Concord.