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Some of the best militaryt maps are those prepared by the Dept of
Military Art and Engineering at U. S. Military Academy West Point.
Their " Military History and Atlas of the Napoleonic Wars" published
by Praeger would probably be a good starting point. West Point also
authored similar sets of maps "West Point Atlas of American Wars"
West Point Atlas of the Civil War", "Campaign Atlas of WW II".
Another series, published mostly in Britain, "World Atlas of Military
History" was first authored by Arthur Banks and completed by other
authors.
Hope this helps. Some of wars and even major battles have home
pages sypported by military historians on the World Wide Web.
You might try a few searches.
Maureen Farrell
Map Collection, Cleveland Public Library