This is a map showing the route of the British army's 18-mile retreat from <a href="https://en.wikipedia.org/wiki/Concord,_Massachusetts" class="extiw" title="en:Concord, Massachusetts">Concord</a> to <a href="https://en.wikipedia.org/wiki/Charlestown,_Massachusetts" class="extiw" title="en:Charlestown, Massachusetts">Charlestown</a> in the <a href="https://en.wikipedia.org/wiki/Battles_of_Lexington_and_Concord" class="extiw" title="en:Battles of Lexington and Concord">Battles of Lexington and Concord</a> on April 19, 1775.  It shows the major points of conflict, as well as showing the route taken by Hugh, Earl Percy's reinforcements.
National Park Service
<a rel="nofollow" class="external free" href="http://data2.itc.nps.gov/parks/mima/ppMaps/MIMAmap2.pdf">http://data2.itc.nps.gov/parks/mima/ppMaps/MIMAmap2.pdf</a>