"The nearest that Callahan came to scoring a knockout or even a knockdown was in the ninth round. He scored a long right to the jaw and it sent �Ad� spinning half way across the ring. His great courage came to his rescue, however, and after bracing himself for a moment against the ropes he fought back with redoubled fury. He showed remarkable ability to recover quickly from the shock of a blow."

New York Herald
August 26, 1916