During the Second World War the American forces in the Pacific engaged in the greatest series of amphibious assaults ever known against tenacious Japanese foe. Many of the assaults turned into brutal bloody encounters, marred often by a lack of experience in these difficult operations against extensive prepared positions; Tinian proved to be the most successful of all of the seaborne operations of the Pacific War. Contains 66 photos and 13 maps and charts. "TINIAN is a small island. In 1944 it was held by only 9,000 Japanese. Yet it was so well defended by nature against an amphibious operation that it might have proved a formidable and costly barrier to the final conquest of the Marianas. It had only one beach area suitable-by previous standards-for a major amphibious landing and that beach was heavily mined and skillfully defended. "The enemy, although long alerted to our intentions to attack Tinian, was tactically surprised when we avoided his prepared defenses and landed on two small beaches totalling in width only about 220 yards. Before he could recover from the shock, he was out-numbered and out-equipped on his own island. His subsequent effort to throw us into the water resulted in complete failure. We then pushed the length of the island in nine days, while suffering casualties light in comparison with those of most other island conquests. "As a participant in the operation, I naturally take pride in this achievement, as well as in Admiral Raymond A. Spruance's evaluation: "In my opinion, the Tinian operation was probably the most brilliantly conceived and executed amphibious operation in World War II.""-C. B. CATES, GENERAL, U. S. MARINE CORPS, COMMANDANT OF THE MARINE CORPS