After finding Special Order No. 191 (see last episode), George McClellan and the Army of the Potomac are pursuing Robert E. Lee and the Army of Northern Virginia west through Maryland. The path that will eventually lead these armies to Antietam will first take them through three gaps in South Mountain. It is here where two future presidents will fight and also where the legendary Iron Brigade got it's name.

This episode was produced in partnership with The Gettysburg Museum of History. See how you can support history education & artifact preservation by visiting their website & store at https://www.gettysburgmuseumofhistory...

Check out ‪@VloggingThroughHistory‬ to see the other side of the collaboration that we did at Antietam.
Battle maps provided courtesy of @American Battlefield Trust .

Support the effort to expand history education on PATREON:   / historyunderground  

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All drone flights conducted by a Part 107 licensed pilot.