Four Wheel Drive name in 1910. Besserdich and Zachow's patented full time four wheel drive system combined a lockable center differential with double-Y constant velocity universal joints for steering. In modern terms the Battleship would be considered All Wheel Drive as all FWD products featured full-time four wheel drive with a lockable center differential. The success of the four-wheel drive in early military tests prompted the company to switch from cars to trucks. In 1916 the U.S. Army ordered 147 Model B three ton trucks for the Pancho Villa Expedition. The U.S. Army ordered 15,000 FWD Model B three ton trucks as the
Four-square cipher the assumed language of the original message. Cryptanalysis of four-square generally involves pattern matching on repeated monographs. This is only the case when the two plaintext matrices are known. A four-square encipherment usually uses standard alphabets in these matrices but it is not a requirement. If this is the case, then certain words will always produce single-letter ciphertext repeats. For instance, the word MI LI TA RY will always produce the same ciphertext letter in the first and third positions regardless of the keywords used. Patterns like these can be cataloged and matched against single-letter repeats in the ciphertext. Candidate