In early 1942, the Japanese Empire had a string of unparalleled successes. It had invaded and captured Wake Island, the Philippines, Burma, Malaya, and the Dutch East Indies. But that would all change in the Battle of the Coral Sea in May.
The battle marked the first time in naval history that opposing fleets fought without seeing each other and was the first aircraft carrier battle. But more importantly, it also stopped the Japanese advance.
Japan Sets its Sights on Australia
The Japanese were ready to keep pushing southwest and had their eyes set on capturing Port Moresby in New Guinea. This would isolate Australia, from where they expected that the Allies would launch an inevitable counterattack. So, by occupying Papua, Fiji, Samoa, part of the Solomons, Nauru, and Ocean Islands, the Japanese would create a defensible southeastward perimeter. This would also allow them to interrupt the lines of communication between the U.S. and Australia.
Admiral Nagano and the Naval General Staff wanted to continue their westward expansion towards Ceylon or India. Nevertheless, Admiral Yamamoto and the Combined Fleet believed that the only way for Japan to defend her interests would be the destruction of the American aircraft carriers.
So, Yamamoto suggested that Japan move against Midway and then threaten Hawaii where the American carrier fleet could be dealt a death blow. Then, with their West Coast threatened, the Americans would sue for peace. This would give the Japanese the quick victory they needed before the American industrial might could be brought to bear.
But the Doolittle Raid changed everything as American land-based B-25 bombers, launched off American aircraft carriers, bombed Japan and Tokyo itself. Although the damage was very slight, the fact that American bombers could attack Tokyo was shocking to Japanese leaders.
The Americans Break the Japanese Naval Code
Nagano ordered Yamamoto to proceed with his Midway plan preceded by a diversionary move in the Aleutian Islands. However, the planned operation for Port Moresby and Tulagi had progressed too far to be called off. So, the Imperial Fleet would be running concurrent operations. This would overextend the Japanese forces. As a result, during the Battle of the Coral Sea, the Japanese would be facing a force of equal strength for the first time.
Operation MO, the operation against Port Moresby, called for the invasion of the port and then for an advance towards New Caledonia, Fiji, Samoa, and Tulagi.
In early 1942, the Japanese Empire had a string of unparalleled successes. It had invaded and captured Wake Island, the Philippines, Burma, Malaya, and the Dutch East Indies. But that would all change in the Battle of the Coral Sea in May.
The battle marked the first time in naval history that opposing fleets fought without seeing each other and was the first aircraft carrier battle. But more importantly, it also stopped the Japanese advance.
Japan Sets its Sights on Australia
The Japanese were ready to keep pushing southwest and had their eyes set on capturing Port Moresby in New Guinea. This would isolate Australia, from where they expected that the Allies would launch an inevitable counterattack. So, by occupying Papua, Fiji, Samoa, part of the Solomons, Nauru, and Ocean Islands, the Japanese would create a defensible southeastward perimeter. This would also allow them to interrupt the lines of communication between the U.S. and Australia.
Admiral Nagano and the Naval General Staff wanted to continue their westward expansion towards Ceylon or India. Nevertheless, Admiral Yamamoto and the Combined Fleet believed that the only way for Japan to defend her interests would be the destruction of the American aircraft carriers.
So, Yamamoto suggested that Japan move against Midway and then threaten Hawaii where the American carrier fleet could be dealt a death blow. Then, with their West Coast threatened, the Americans would sue for peace. This would give the Japanese the quick victory they needed before the American industrial might could be brought to bear.
But the Doolittle Raid changed everything as American land-based B-25 bombers, launched off American aircraft carriers, bombed Japan and Tokyo itself. Although the damage was very slight, the fact that American bombers could attack Tokyo was shocking to Japanese leaders.
The Americans Break the Japanese Naval Code
Nagano ordered Yamamoto to proceed with his Midway plan preceded by a diversionary move in the Aleutian Islands. However, the planned operation for Port Moresby and Tulagi had progressed too far to be called off. So, the Imperial Fleet would be running concurrent operations. This would overextend the Japanese forces. As a result, during the Battle of the Coral Sea, the Japanese would be facing a force of equal strength for the first time.
Operation MO, the operation against Port Moresby, called for the invasion of the port and then for an advance towards New Caledonia, Fiji, Samoa, and Tulagi.
The Japanese didn’t expect any large Allied fleet in the area. And they were confident that they would easily dispatch any Allied fleet that entered the Coral Sea to stop them. They had two powerful aircraft carriers the Shokaku and the Zuikaku and the light carrier Shoho.
But unknown to them, American cryptographers, along with British and Australian intelligence teams, were getting increasingly better at cracking Japanese codes. The allies had set up their codebreaking efforts in Australia under Fleet Radio Unit Melbourne or FRUMEL. And FRUMEL had intercepted Japanese plans to invade Port Moresby.
Port Moresby wasn’t just important to the Japanese. Admiral Chester Nimitz, the Commander-in-Chief of the United States Pacific Fleet (CINCPAC), needed it not just for the defense of Australia, but as a springboard for future moves in the southwestern Pacific.
The Battle of the Coral Sea Commences
Although the Allies had broken the Japanese codes and knew what their intentions were, countering them was another story. The Saratoga wasn’t in the Coral Sea but in Puget Sound undergoing repairs. And the aircraft carriers Enterprise and Hornet hadn’t returned from the Doolittle Raid. So, Nimitz dispatched the air groups of the USS Yorktown and Lexington.
The Yorktown Task Force 17 included the heavy cruisers Astoria, Chester, and Portland, six destroyers, and the tanker Neosho. The Lexington Task Force 11 consisted of the heavy cruisers Minneapolis and New Orleans and five destroyers.
On May 4, the Yorktown launched strikes on the Japanese forces that had invaded Tulagi. It irreparably damaged a destroyer, sunk three minesweepers, and four landing barges. Each side maneuvered toward the other unaware of the exact location of the opposing fleet.
The Japanese sighted the tanker Neosho, misidentifying it for an aircraft carrier, and the destroyer Sims. Twenty dive bombers scored seven direct hits turning the ship into a blazing inferno. She, nevertheless, managed to drift for four days until the surviving crew abandoned her and she was scuttled. The Sims took three direct bomb hits, two of which to the engine room. The keel buckled and the Sims sank quickly along with 379 members of her crew.
American scout planes had sighted several Japanese ships and Admiral Fletcher launched 93 aircraft in an attack of his own. Arriving at the presumed location of the enemy, they spotted the light carrier Shoho about 20 miles away. Shoho was blasted by 13 bombs and seven torpedo hits and was set hopelessly ablaze. Back on the Lexington, the radio room could hear the chatter of Lieutenant Commander Dixon of a Dauntless dive bomber squadron. “Scratch one flattop… Dixon to carrier, scratch one flattop.”
At midnight, the Japanese decided to postpone the invasion for two days.
Both Sides Bruise the Other
On May 8, the battle still raged. Each side launched carrier aircraft to attack the other. Pilots from Yorktown spotted the Japanese carrier Shokaku and hit her with two bombs just before 1100 hours. One penetrated the flight deck forward of the starboard bow and set fire to the fuel. The other hit aft. Although she could still receive aircraft, Shokaku couldn’t launch any.
The Japanese found the American fleet at 1118. Yorktown skillfully evaded eight torpedoes, but the dive bombers scored a direct hit which penetrated down to the fourth deck. Yet, she was able to continue with flight operations.
A torpedo hit Lexington at 1120 quickly followed by another. She was also hit by two small bombs. The hits from the torpedoes were handled by damage control parties and the listing of the ship was countered by shifting oil ballast. It appeared that she would live to fight another day and she began to receive returning aircraft.
However, at 1247 hours, a massive explosion shook the ship. Fuel vapors from a generator, which had been left running, ignited. Several other explosions followed. At 1445 hours, another massive explosion put the fires out of control. By 1710, the order was given to abandon ship. It was an orderly rescue and even the ship’s dog was saved. At 1956 hours the destroyer Phelps launched seven torpedoes to scuttle the Lexington and at 2000 hours she sank with a final explosion. The Battle of the Coral Sea was over.
The Aftermath of the Coral Sea and the Lead-up to Midway
Tactically, the battle was a victory for the Japanese. They had sunk the Lexington, Sims, and Neosho and had severely damaged Yorktown while only losing the light carrier Shoho and some smaller craft at Tulagi.
Strategically, however, it was an American victory. Without the aircraft carrier Shokaku able to launch supporting aircraft, and the heavy losses from the air groups of the Zuikaku, the invasion of Port Moresby was called off. Worse still, the damage to the two carriers kept them out of the upcoming Battle of Midway. On the other hand, Yorktown would limp back to Pearl Harbor and be repaired in time to fight in the upcoming battle.
The Allies had stopped the overconfident Japanese for the first time in the war. They didn’t attribute that the American fleet showing up at exactly the right place and time with two aircraft carriers was due to the Americans having broken their naval codes. They considered those to be unbreakable.
Yet, the next month at Midway, the same cryptoanalysis would lead to the Americans once again knowing the Japanese plan in advance. Because of that, Japan would suffer catastrophic losses that would turn the war’s tide.
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