Question about poetry (literal meaning)?

This poem is basically about the ride of Paul Revere and his famous "the red coats are coming!" warning because Adams and John Han were in either lexington or concord ((i cant remember which)) and the British wanted to kill them because they were against Britain controlling America. so the british rode from boston through lexington to get to concord i believe ((where han and adams were)) but small american militias stopped the british troops at lexington and were able to hold them off for a short while, enabling han and adams to escape.