Battle of Leyte Gulf

The Battle of Leyte Gulf in October 23-26, 1944, was the largest naval battle in world history, in terms of total combatant personnel and firepower. It was fought in the seas around and to the east of the Philippine Islands between the Japanese Imperial Navy and Allied naval forces. The bulk of naval combat took place after the initial troop landings on the island of Leyte.

Both sides suffered from divided command. The only joint commanders were in Washington and Tokyo.

American situation

U.S. Pacific strategy derived from Joint Chiefs of Staff decisions at the Cairo Conference (1943), to obtain "bases from which the unconditional surrender of Japan can be forced." There was, however, little clarity and much argument among the JCS and the two theater commanders, Douglas MacArthur for the Southwest Pacific Area and Chester Nimitz for the [Central] Pacific and Pacific Ocean Areas. JCS guidance to Nimitz and MacArthur, dated 12 March 1944, reflected what was to become an obsolete concept: "The JCS has decided that the most feasible approach to Formosa, Luzon and China is by way of the Marianas, Luzon and China."

Events were to make Formosa, Luzon and China infeasible as the final bases for attacks on the Japanese home islands.

Concept of operations

MacArthur had a deep emotional bond to the Phillipines, and both believed the honor of the United States required their liberation and that such an approach was strategically sound.

Command structure

U.S. units involved in naval combat

United States Third Fleet under Admiral William Halsey reported to Admiral Chester Nimitz, and had the roles of defeating the major Japanese fleet and taking the islands of the Central Pacific. To increase the tempo of operations, the same ships were Third Fleet when under Halsey and his staff, and Fifth Fleet when under Admiral Raymond Spruance. Spruance and Halsey, without friction, alternated in planning and executing operations.

The Joint Chiefs in Washington had never been able to agree on a single commander for the Pacific. Nevertheless, the Third and Seventh Fleets were standing organizations that had reasonable internal communications.

Seventh Fleet mission

Under MacArthur, the Seventh Fleet, commanded by Vice Admiral Thomas Kinkaid (commander, Allied Naval Forces, Southwest Pacific Area) had the mission of landing and supporting the landing force. Although code names were less frequently used to describe Pacific operations, the Seventh Fleet plan was designated Operation MUSKETEER/Operation KING V. Kinkaid's flagship was the amphibious command ship USS Wasatch, where he was accompanied by the Commander of the United States Sixth Army, Lieutenant General Walter Krueger. Kinkaid's deputy, VADM Thomas Wilkinson, was on the secondary flagship, command ship USS Olympus, which also commanded the Southern Attack Force. MacArthur's seagoing headquarters was on the cruiser USS Nashville.

Northern Attack Force, under RADM Daniel Barbey aboard USS Blue Ridge, was to land the X Army Corps under MG F.C. Sibert.

Southern Attack Force carried XXIV Army Corps under MG J.R. Hodge. Transport task groups carried divisions. Fire Support Unit South was made up of old battleships and other heavy gunships under RADM Jesse Oldendorf, and TG 77.4, the Escort Carrier Group, was under RADM Thomas Sprague.

Third Fleet mission

There was much more ambiguity in the mission of Vice Admiral William Halsey's Third Fleet.

Japanese situation

As with the U.S. forces, the only common command was at the national capital. Admiral Soemu Toyoda directed a number of units, which had extremely poor coordination — even rivalry — with one another.

Japanese order of battle

Concept of operations

At first, the Japanese concept of Operation SHO-GO sought the Mahanian "decisive battle" of major fleet units.

The battle

By the time landings had started, the most crucial Japanese objective was to attack the transports and other Seventh Fleet ships. They planned a two-pronged attack, through Surigao Strait and through San Bernadino Strait; the latter passes Samar. Their main body was Kurita's Force A within the First Striking Force. Two uncoordinated forces were to try to approach through Surigao Strait, Nishimura's Force C and Shima's Second Striking Force. Meanwhile, Ozawa was to continue acting as a decoy to divert Third Fleet away from the Japanese attack forces.

The U.S., however, did not understand either the actual Japanese organization, or that the Mobile Force's role was that of a sacrificial decoy.

U.S. understanding of Japanese forces

Japanese scouting

American forces shot down a Japanese scout plane on the 20th. Unknown to the U.S., it was looking for kamikaze targets, but probably due to poor communications, the Japanese did not start coordinated kamikaze operations. They managed a single attack on the 21st, damaging the cruiser HMAS Australia.

The Fight in Palawan Passage

On 23 October, Japanese Center Force was sighted by U.S. patrol submarines, USS Darter and USS Dace, in Palawan Passage. After reporting it to higher headquarters, USS Darter and USS Dace torpedoed three heavy cruisers, sinking two and damaging a third such that it had no additional role in the war. The first, IJN Atago, was Admiral Kurita's flagship; Rear Admiral Ugaki took temporary command until Kurita was rescued by a destroyer,

This was the first of several shocks to Kurita, which may have affected his later judgment. It was also a key intelligence datum to the U.S. command.

Battle of the Sibuyan Sea

Vice Admiral Willis Lee was Commander, Battleships, Pacific Fleet, and wore the "second hat" of commanding Task Force 34 (battleships) of Third Fleet. TF 34, however, never operated independently; Lee's reports collated information from battleships and other heavy surface combatants operating with the fast carrier groups. They reported finding a Japanese force on the morning of the 24th.

In this action, Third Fleet indeed sank the superbattleship IJN Musashi.

Battle of Surigao Strait

Equipped with superb optics, the Japanese began the war ruling night action. The Allied development of radar, however, neutralized this advantage, but the Japanese often still preferred stealth by night.

Action off Samar

Sometimes called the Battle of San Bernadino Strait, the Action off Samar describes the improvised and successful American defense against Kurita's Force A, which was attempting to break into Leyte Gulf. While his Force A had lost combat power in the preliminaries and the Battle of the Sibuyan Sea, it was still an immensely powerful gunfire force that could devastate the transports and support vessels in Leyte Gulf.

Battle of Cape Engano

On the 24th, Ozawa launched an air strike against Halsey, more to get his attention than expecting to do serious damage. After the survivors returned, he formed a surface Advanced Guard under RADM Masuda, to "divert the enemy" in support of Kurita's main effort. Initially delighted when he intercepted messages from U.S. search planes, he thought he finally had attracted Halsey.

On learning that Kurita had reversed course after the Action off Samar, Ozawa concluded that Operation SHO-GO had failed, and turned north to save what he could. An hour later, Combined Fleet ordered Ozawa to resume his attack. He recalled Masuda to join his main force.

Halsey, who believed the Japanese carriers were the principal Third Fleet objective, brought them under attack on October 25 and 26.

Outcome

By 1944, and even after the Battle of Pearl Harbor, it was obvious that aircraft and the aircraft carrier had replaced the battleship as the decisive factor in major naval combat. At the Battle of the Phillipine Sea, fought before Leyte Gulf, Japanese naval aviation was essentially destroyed — aircraft carriers without skilled pilots are useless.

Leyte Gulf, however, effectively destroyed the Imperial Japanese Navy as a surface force. Of the 282 warships engaged (216 American, 2 Australian, and 64 Japanese), the Japanese lost 4 carriers, 3 battleships, 10 cruisers, and 11 destroyers. American losses totaled one light carrier, two escort carriers, and three destroyers.

Halsey always defended his decision to abandon Leyte; its defense was Kinkaid's job and his mission was strategic.

Japan did not effectively defend the Phillipines. It has been reported that Emperor Hirohito refused the operational decision of the able field commander, General Tomiyuki Yamashita, who had wanted to make his stand on Luzon, not Leyte. The Emperor said,

Contrary to the views of the Army and Navy General Staffs, I agreed to the showdown battle of Leyte thinking that if we attacked at Leyte and America flinched, then we would probably find room to negotiate.