From The Battle for Leyte Gulf: The Incredible Story of World War II’s Largest Naval Battle, by C. Vann Woodward (Skyhorse, 2007), Kindle pp. 1-3:
The Battle of Leyte Gulf was the greatest naval battle of the Second World War and the largest engagement ever fought on the high seas. It was composed of four separate yet closely interrelated actions, each of which involved forces comparable in size with those engaged in any previous battle of the Pacific War. The four battles, two of them fought simultaneously, were joined in three different bodies of water separated by as much as 500 miles. Yet all four were fought between dawn of one day and dusk of the next, and all were waged in the repulse of a single, huge Japanese operation.
For the Japanese the battle represented the supreme naval effort of the war. They committed to action virtually every operational fighting ship on the lists of the Imperial Navy, which at that time still commanded a formidable surface force. Among the nine enemy battleships present were the two new leviathans of the Yamato class, which were designed as the most powerful warships in the world and far outweighed our heaviest ships. These forces, organized in three fleets, were hurled at our newly established beachhead in the Philippines from three directions.
They were guided by a master plan drawn up in Tokyo two months before our landing and known by the code name Sho Plan. It was a bold and complicated plan calling for reckless sacrifice and the use of cleverly conceived diversion. As an afterthought the suicidal Kamikaze campaign was inaugurated in connection with the plan. Altogether the operation was the most desperate attempted by any naval power during the war — and there were moments, several of them in fact, when it seemed to be approaching dangerously near to success.
Unlike the majority of Pacific naval battles that preceded it, the Battle of Leyte Gulf was not limited to an exchange of air strikes between widely separated carrier forces, although it involved action of that kind. It also included surface and subsurface action between virtually all types of fighting craft from motor torpedo boats to battleships, at ranges varying from point-blank to fifteen miles, with weapons ranging from machine guns to great rifles of 18-inch bore, fired “in anger” by the Japanese for the first time in this battle. Whether or not the Battle of Leyte Gulf will be the last of its kind fought upon the high seas, it may be said to have brought to its maximum development the tendency of an era toward heavy ordnance and armor.
The major phase of the battle opened in the Sibuyan Sea with strikes by our carrier-based aircraft against the largest Japanese surface force. The enemy replied with land-based and carrier-based air strikes against our carriers. The next phase was a night surface battle between two other forces in Surigao Strait, entirely devoid of air action but including the largest torpedo attack of the war and one of the heaviest gunnery actions. On the following day at dawn two new battles opened. The one off Cape Engaño to the north was a one-sided carrier aircraft action against a Japanese carrier-battleship force. That to the south off Samar Island was fought between two of the most oddly matched forces which ever joined action — the heaviest enemy surface ships in existence against our light escort carriers. The engagement had not been contemplated by either side, and came as a complete surprise to both.
In order to understand the scale upon which the Battle of Leyte Gulf was fought, it might be well to draw a few comparisons with forces involved in an earlier Pacific engagement. In the Battle of Midway, one of the most important actions of the war, our forces entered the engagement with three aircraft carriers. At Leyte Gulf we used eight carriers, eight light carriers, and sixteen escort carriers — thirty-two in all. This is not to say that the latter action was ten times the size or importance of the earlier, but that the scale of air action had increased in something like that proportion. At Midway, of course, there was no surface action and our force contained no battleships. In our two fleets participating in the Philippines battle we had twelve battleships to the enemy’s nine.