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In page Benjamin Butler:

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General Butler also commanded a number of United States Colored Troops regiments which he deployed in combat during the Battle of Chaffin's Farm (sometimes also called the Battle of New Market Heights). The troops performed extremely well, and in the case of the 38th United States Colored Troops regiment, who had overcome overwhelming fire, heavy casualties and thick physical obstacles to overwhelm a more powerful force, he awarded a number of men the Medal of Honor. He also ordered a special medal designed and struck and awarded to 200 African-American soldiers who had served with distinction in the engagement. This was later called the Butler Medal.