The entire battle, including the British retreat, is re-enacted every Patriot''s Day in April with period clothes and weaponry. It was early in the morning on April 19, 1775 when Paul Revere began his famous ride. By dawn, British soldiers were advancing on Concord, where they believed colonists had stored a cache of weapons and where they intended to arrest several leading revolutionists, including Sam Adams. But the British were welcomed with shots that were later heard around the world.