[1] After traveling to the United States, Moneghan settled in New York, and took on prize fighting.
It is unknown how many contests he fought, but on December 18, 1855 he was proclaimed Lightweight Champion of America when he defeated James Hart after 45 rounds, and 51 minutes of fighting.
[3] This bout is often incorrectly listed by historians, including the late Nat Fleischer, as ending in the tenth round.
Hart retired, and Moneghan immediately reclaimed the title, which he held until his battle with Young Barney Aaron on September 28, 1857.
The two men fought near Providence, RI for 80 rounds and over three hours before Moneghan was forced to accept defeat.