Citation

Captured the flag of the 6th Alabama Cavalry (C.S.A.).

http://www.cmohs.org/recipient-detail/1136/riddell-rudolph.php

Civil War Congressional Medal of Honor Recipient. Served during the Civil War as a Lieutenant in Company I, 61st New York Volunteer Infantry. He was awarded the CMOH for his bravery at the Battle of Sailors Creek, Virginia on April 6, 1865. His citation reads "Captured the flag of the 6th Alabama Cavalry (C.S.A.)". His Medal was awarded to him on May 10, 1865.

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=5799393

http://www.homeofheroes.com/gravesites/states/pages_pz/riddell_rudolph_ny.html