[OHM] tagging unit movements

[Richard Welty]

one of my main interests in historic mapping is plotting out the movement of
units in military campaigns and battles, and the first effort i plan to 
make in
openhistoricalmap will be based on the 1908 Cope Maps of the Battle of
Antietam.

has anyone given any thought into how represent something like this?

the Cope maps are at roughly half hour to 1 hour intervals over
the course of September 17th, 1862 and are in the public domain,
as they are US Government publications from 1908. they unit
locations, historic buildings and the road network in the area around
Sharpsburg, Maryland and crops and fields of the period as well.

richard