John O'Neal a native of Ireland, was a United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 sailor who received the Medal of Honor

Medal of Honor

The Medal of Honor is the highest military decoration awarded by the United States government. It is bestowed by the President, in the name of Congress, upon members of the United States Armed Forces who distinguish themselves through "conspicuous gallantry and intrepidity at the risk of his or her...

for heroism on April 12, 1872.

Medal of Honor citation

Serving on board the U.S.S. Kansas, O'Neal displayed great coolness and self-possession at the time Comdr. A. F. Crosman and others were drowned near Greytown, Nicaragua, 12 April 1872, and by personal exertion prevented greater loss of life.