Order of Battle

THE ARMY OF THE POTOMAC - Major General George B. McClellan, USA, commanding

This is an interactive tree diagram of the organization of the Federal Army of the Potomac on the Maryland Campaign.

• Click on a solid red dot to expand the tree from that point.
• Click an open red circle to the left to collapse a branch.
• Click on a unit's name to go to the page for that unit for more detail and links to related people, maps, and tablets.

There's about enough room on this screen to see all of an Army Corps' units at once. Open much more than that, and they start to scrunch together.

This visualization is built on the fabulous work of Mike Bostock utilizing the d3.js library, shared as open source software under GNU General Public (v3) and BSD 3-clause licenses.

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