On the evening of 18 April, Paul Revere and William Dawes roade to alert Patriots that the British invasion forces were on their way to Concord to destroy arms. A battle ensued on 19 April. The Massachusetts Minutemen lost 8 men, while the British took 237 casualties.
Richert, Lucas Paul. "Paul Revere warns of invasion". The Literary Encyclopedia. First published 01 February 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5914, accessed 20 May 2013.]