The Tetrarch
Depth Charge was a registered Thoroughbred son of Bold Venture. His dam was a mare named Quickly, a descendant of The Tetrarch and the imported to the United States stallion Rock Sand. Depth Charge was bred by John D. Hertz. Quickly was also the dam of Count Fleet, a U. S. Triple Crown winner. Depth Charge was a year younger than his famous half brother.