It would appear the award for capture of flags and others cited such as Sailor's Creek were not purged . See:

On June 3, 1916 Section 122 of the National Defense Act was passed, calling for a board of five retired Army generals to review every award of the Medal of Honor to date. Retired Lieutenant General Nelson Miles, a Medal of Honor recipient himself and past commander of the Medal of Honor Legion, presided over the board which met from October 16, 1916 until January 17, 1917. When reviewed, the citations did NOT identify any recipient by name. Each of the 2,625 Medals of Honor awarded up to the time of the review was given a number, so that each case would be decided on the merit of the action without undue prejudice.

http://www.homeofheroes.com/moh/corrections/purge_army.html

Here are three more of the CW awards.

Capture of Confederate guidon.

Took one of the first prisoners, a captain

John F. Hartranft, Army Colonel, First Battle of Bull Run, Virginia Jul 21, 1861,
Remained in battle despite his term of service having ended.