Battles
Harper's Ferry, 13-15 September 1862
Vermont units present/engaged: 9th Infantry
Casualties
The entire regiment was briefly captured.
Readings
See Captain E. H. Ripley's rendition of the battle in Volume 2, Chapter XXII of George Benedict's "Vermont in the Civil War," starting on page 191.
Bibliography
Battle of Harper's Ferry (Wikipedia)
Harper's Ferry (CWSAC Battle Summaries)
Harper's Ferry (American Battlefield Trust)