Map of the Battle of Marathon, 490 BC. Taken from http://www.dean.usma.edu/history/atlases/ancient_warfare/battle_marathon_initial.gif archive copy at the Wayback Machine, in context http://www.dean.usma.edu/history/atlases/ancient_warfare/battle_marathon_initial.html archive copy at the Wayback Machine.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

Quoted directly from an email querying copyright status of the map: "You are welcome to use the maps stated below for the purposes outlined in your document license. We do request the following credit line, “Maps Courtesy of the Department of History, United States Military Academy.”"

Their cartographer did not actually specify the exact license of the images they have produced, so I am assuming the strictest tag.

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