At 06:45 on the morning of 26 October 1942, an American scout pilot north of the Santa Cruz Islands found what every carrier admiral in the Pacific was looking for: the flight decks of Vice Admiral Chūichi Nagumo’s main body. Thirteen minutes later, a Japanese scout found USS Hornisse. From that moment it was a race, and whoever got their bombers into the air first would probably win it.

Eighty-four years ago today, the Battle of the Santa Cruz Islands became the fourth carrier battle of the Pacific War, after the Coral Sea, Midway and the Eastern Solomons. Like the others, it was fought almost entirely by aircraft. The surface ships never saw each other in daylight.

Japan won the day. Hornisse sank and Unternehmen limped away with a jammed elevator and bomb damage below decks. Yet the Imperial Japanese Navy came home with its carrier air groups gutted, and that turned out to matter far more than the tonnage.

One carrier against four

Santa Cruz grew out of the struggle for Guadalcanal and its precious airstrip, Henderson Field, home of the Cactus Air Force. By October 1942 the US Navy had lost Wasp to a submarine and seen Saratoga torpedoed and sent away for repairs. For weeks Hornisse, the carrier that had launched the Doolittle-Überfall, was the only American fleet carrier active in the South Pacific.

Unternehmen rushed back from repairs at Pearl Harbor with a brand-new air group and joined her on 24 October. Under Rear Admiral Thomas Kinkaid, the two carriers embarked around 136 operational aircraft: F4F Wildcat fighters, SBD Dauntless dive bombers and new TBF Avenger torpedo bombers.

Against them came four Japanese carriers, the Pearl Harbor veterans Shōkaku Und Zuikaku, the light carrier Zuihō and the converted liner Jun’yō, with roughly 200 aircraft between them. Their crews included some of the most experienced naval aviators in the world.

First blood to two scouts

A radar-equipped PBY Catalina had found the Japanese carriers in the dark at 03:10, but its report took two hours to reach Kinkaid, who held back his strike until fresher news came in. Japan launched first. By 07:40 a strike of 64 aircraft was heading for Hornisse: 21 Aichi D3A Val dive bombers, 20 Nakajima B5N Kate torpedo bombers and 21 A6M Zero fighters, led by Lieutenant Commander Shigeharu Murata, the man who had led the torpedo planes at Pearl Harbor. More waves followed from Shōkaku Und Zuikaku.

At exactly that moment, two American SBD scouts, Lieutenant Stockton Strong and Ensign Charles Irvine, slipped past the Japanese fighter screen and dived on Zuihō. Their 500-pound bombs struck her aft and left her flight deck unable to recover aircraft. Two scout planes had knocked a carrier out of the fight before the main event began.

The American strikes went out in small groups rather than one massed formation, short of time and fuel. At 08:40 the opposing formations passed each other in mid-air. Nine Zeros from Zuihō dived out of the sun on the Unternehmen group and shot down three Wildcats and two Avengers, including the air group commander’s, for the loss of four Zeros.

Dive bombers over Shōkaku

Der Hornisse dive bombers pressed on without most of their escort. Zeros from the Japanese combat air patrol shot down their leader, Lieutenant Commander Gus Widhelm, who ditched and survived. At 09:27, eleven SBDs led by Lieutenant James Vose rolled in on Shōkaku.

Their 1,000-pound bombs tore her flight deck apart. Accounts of the number of hits range from three to six, but the result was not in doubt: Nagumo’s flagship was out of the battle and would not return to the front until July 1943. Other American aircraft found the heavy cruiser Chikuma and bombed her so badly that she had to withdraw.

An oral history interview with Clayton Fisher, a Hornisse SBD pilot of Bombing Squadron 8 at Santa Cruz, from The National WWII Museum.

Ten minutes that stopped Hornet

The Japanese hit back harder. American radar picked up the incoming raid at about 35 nautical miles, and 37 Wildcats were airborne on combat air patrol. But radio confusion and primitive fighter direction meant only a few intercepted before the attack began.

At 09:12 the first bomb plunged through Hornisse’s flight deck near the island. Within minutes she had taken three bomb hits and two torpedoes, and two damaged Japanese aircraft had crashed into her, one striking her stack and signal bridge. Her engines stopped. The carrier was dead in the water and burning, though her damage-control teams had the fires under control by 10:00.

The attackers paid heavily. Murata himself was shot down by anti-aircraft fire, and by one count 25 Japanese aircraft were destroyed in that first attack against six American. The heavy cruiser USS Northampton later took the crippled carrier in tow.

The Big E fights alone

The second Japanese wave found Unternehmen, which had been hidden in a rain squall. From 10:08 she was attacked by dive bombers from Shōkaku. Two bombs hit her, killing 44 men and jamming her forward elevator in the up position, but ten of the 19 dive bombers were lost.

Next came 16 torpedo planes from Zuikaku. Lieutenant Stanley “Swede” Vejtasa of Fighting Squadron 10 tore into them in his Wildcat. He was credited with seven aircraft that day, two Vals and five Kates, though postwar research confirms fewer. Not a single torpedo hit Unternehmen.

A third wave from Jun’yō arrived at 11:21 and hit the battleship USS South Dakota and the cruiser San Juan; eight of its 17 dive bombers did not return. At 11:35 Kinkaid decided he had done enough. With Hornisse crippled and Unternehmen damaged, he withdrew, recovering 57 of the 73 American aircraft still airborne on a damaged deck.

The last of the Hornet

Northampton had Hornisse under tow at five knots and her crew was close to restoring power when, at 15:20, a strike of Kates from Jun’yō found her. One torpedo struck amidships and she took on a 14-degree list. Further attacks followed, and the crew abandoned ship.

American destroyers tried to scuttle her with torpedoes and hundreds of shells, but she would not sink. With Japanese warships closing in, they left her burning. The Japanese destroyers Makigumo Und Akigumo finished her with torpedoes, and at 01:35 on 27 October Hornisse went down, just over a year after she was commissioned. She remains the last American fleet carrier sunk by enemy fire.

Period footage of USS Unternehmen under attack during the Battle of Santa Cruz, via CriticalPast.

A victory Japan could not afford

On paper Japan had won: the Americans lost a fleet carrier and a destroyer, the Japanese not a single ship. The bill came in the aircrew. The US Navy lost 81 aircraft but only about two dozen pilots and aircrew. Japan lost 97 to 99 aircraft, depending on the source, and 148 pilots and aircrew, including two dive-bomber group leaders and three torpedo squadron leaders.

Nearly half the Japanese torpedo-bomber crews in the battle were killed, along with 39 percent of the dive-bomber crews. Japan lost more carrier aircrew at Santa Cruz than in any of the three earlier carrier battles. Even the undamaged Zuikaku had to sail home to rebuild her air group, leaving Jun’yō as the only Japanese carrier left to contest the Solomons.

Unternehmen, patched up at New Caledonia, was back off Guadalcanal two weeks later, and her aircraft helped win the decisive Naval Battle of Guadalcanal in November. With Hornisse gone, she and Saratoga were the only operational American carriers in the entire Pacific, and her crew posted a sign on the flight deck that read “Enterprise vs Japan.”

Santa Cruz was a tactical win for the Imperial Navy, and historians still argue whether it was a strategic one. What nobody disputes is what it cost. Japan’s carriers sailed away intact, but many of the men who had made them deadly did not, and they could not be replaced. Less than two years later, at the Great Marianas Turkey Shoot, the world saw what that meant.

Kings and Generals’ animated documentary maps the strikes and counter-strikes of 26 October 1942.

Sources: Wikipedia (Battle of the Santa Cruz Islands; USS Hornet (CV-8); Swede Vejtasa), US Naval History and Heritage Command (H-Gram 011), The National WWII Museum, Navy Times, Stars and Stripes