On the morning of August 7, 1942, the United States went on the offensive for the first time in the Pacific War. Six months after Pearl Harbor and two months after the decisive naval victory at Midway, Marines of the 1st Marine Division stormed the beaches of a jungle-covered island in the Solomon chain that most Americans had never heard of. By the time the campaign ended six months later, Guadalcanal had become the proving ground of the modern Marine Corps. The cost: over 1,600 Americans killed on land, more than 4,900 sailors killed at sea, dozens of ships sunk in what became known as Iron Bottom Sound, and an island that the Japanese would never recover from losing.
Why Guadalcanal
In the spring of 1942, the Japanese were expanding south through the Solomon Islands with the goal of cutting the Allied supply lines between the United States and Australia. When U.S. intelligence discovered that the Japanese had begun constructing an airfield on the northern coast of Guadalcanal, the strategic calculus changed overnight. A functioning Japanese airbase in the southern Solomons would threaten New Caledonia, Fiji, and Samoa. It would put Japanese bombers within range of Allied shipping routes across the entire South Pacific.
The Allies could not allow the airfield to become operational. What followed was codenamed Operation Watchtower. The troops who had to execute it called it something else: Operation Shoestring. Because that was exactly what it was.
D-Day in the Pacific: August 7, 1942
The assault force was built around the 1st Marine Division under Major General Alexander Archer Vandegrift. The division had been activated less than a year and a half earlier. Most of its Marines had never seen combat. Many were still carrying World War I era equipment. Supplies were short, intelligence was thin, and rehearsal landings off Fiji had been a disorganized mess. None of that mattered on the morning of August 7.
Approximately 11,000 Marines hit the beaches across three objectives. On Guadalcanal itself, the 1st Marine Regiment and 5th Marine Regiment landed on the northern coast near Lunga Point and pushed inland toward the half-finished Japanese airfield. Resistance on Guadalcanal was light. The Japanese construction troops and their Korean laborers scattered into the jungle. By the afternoon of August 8, Marines had seized the airstrip and renamed it Henderson Field, after Major Lofton Henderson, a Marine aviator killed at Midway.
The story was different on the smaller islands across Sealark Channel. On Tulagi, Gavutu, and Tanambogo, Marines from the 1st Raider Battalion and 1st Marine Parachute Battalion faced entrenched Japanese Special Naval Landing Force troops who fought to the last man. The fighting on Tulagi took two days of close combat through caves and defensive positions. It was a grim preview of what the Pacific War would look like for the next three years.
The Navy Pulls Out
On the night of August 8, the situation changed. A Japanese cruiser force under Vice Admiral Gunichi Mikawa caught the Allied screening force off guard in what became the Battle of Savo Island. In 32 minutes of close-range night fighting, the Japanese sank four Allied heavy cruisers. The USS Quincy, USS Vincennes, USS Astoria, and HMAS Canberra were all lost. Over 1,000 sailors died. It was the worst naval defeat in American history since the War of 1812.
The next morning, Rear Admiral Richmond Kelly Turner made the decision to withdraw his transport fleet. The transports had not finished unloading. When the ships disappeared over the horizon, the Marines on Guadalcanal were left with 37 days of food, limited ammunition, no heavy equipment, and no naval support. They were alone on a hostile island with an enemy who was already planning to take it back.
Henderson Field: The Center of Gravity
Everything at Guadalcanal orbited Henderson Field. The Marines understood immediately that whoever controlled the airstrip controlled the island. The 11th Marine Regiment, the division's artillery, registered its guns to cover every approach. Infantry from the 1st and 5th Marines dug in around the perimeter. Engineers worked around the clock to finish the runway using captured Japanese equipment.
On August 20, the first aircraft arrived. Nineteen Wildcat fighters and twelve Dauntless dive bombers landed on the still-rough airstrip. They were the nucleus of what became the Cactus Air Force, named after the Allied codename for Guadalcanal. These pilots and their planes would become the single most important factor in holding the island. As long as Henderson Field was operational, the Japanese could not safely bring transports within range during daylight hours. Every Japanese effort for the next four months would aim at one thing: knocking out that airfield.
The Battle of the Tenaru: First Blood
The first major Japanese ground attack came on the night of August 21. Colonel Kiyonao Ichiki led approximately 900 soldiers from his elite 28th Infantry Regiment in a frontal assault across a sandbar at the mouth of Alligator Creek, which the Marines mistakenly called the Tenaru River. Ichiki believed his force was attacking a demoralized garrison that would break at the first charge. He was wrong.
Marines from the 1st Marine Regiment were dug in behind the creek bank with overlapping fields of fire. When Ichiki's troops surged across the sandbar, they ran into machine guns, rifles, and canister rounds from 37mm anti-tank guns fired at point-blank range. The Japanese charge was cut to pieces. At dawn, Vandegrift sent a battalion across the creek to envelop the survivors. By mid-morning, the Ichiki Detachment had been virtually annihilated. Over 800 Japanese were killed. Marine casualties were 44 dead and 71 wounded.
The Battle of the Tenaru established the pattern for Guadalcanal. The Japanese would attack with fury, the Marines would hold with discipline and firepower, and the Japanese would be destroyed. But the attacks would keep coming, each one larger than the last.
Edson's Ridge: The Night the Line Almost Broke
The most dangerous moment of the entire campaign came on the nights of September 12 to 14. Major General Kiyotake Kawaguchi landed 6,000 troops east of the Marine perimeter and planned a three-pronged night assault on Henderson Field. His main effort would push through the jungle south of the airstrip and attack over a grassy ridge that overlooked the field.
Defending that ridge was the 1st Marine Raider Battalion under Colonel Merritt "Red Mike" Edson, reinforced by the 1st Marine Parachute Battalion. Together the two units numbered roughly 840 men. They faced a force seven times their size.
On the night of September 12, Japanese forces hit Edson's position from the south. The fighting was at hand-grenade range. Japanese troops broke through the front lines in multiple places. Edson pulled his men back to the final ridgeline. 1,000 yards from Henderson Field. And held. Throughout the night, Edson walked the line under fire, repositioning squads, rallying Marines, and calling in artillery from the 11th Marines that landed within 200 yards of his own positions.
The Japanese attacked again on the night of September 13. This time the assault was even more ferocious. Waves of Japanese infantry charged up the ridge, penetrating the Marine lines repeatedly. At one point, enemy soldiers were within yards of the division command post. The 11th Marines' artillery fired over 1,800 rounds that night. Massed artillery fire broke up each Japanese assault wave just as it reached the crest.
By dawn on September 14, the ridge was still in Marine hands. Kawaguchi's force had lost over 1,200 killed. Edson was awarded the Medal of Honor. The ridge was renamed Edson's Ridge. It had been the closest the Japanese ever came to retaking Henderson Field.
Carlson's Raiders: The Long Patrol
While the main battle raged around Henderson Field, the 2nd Marine Raider Battalion under Lieutenant Colonel Evans Carlson conducted one of the most remarkable operations of the campaign. In November 1942, Carlson's Raiders landed by boat at Aola Bay on Guadalcanal's southern coast and embarked on a 30-day, 150-mile patrol through the island's interior. Operating behind Japanese lines, the Raiders destroyed enemy supply dumps, ambushed patrols, and killed an estimated 488 Japanese soldiers while losing only 16 of their own. Carlson's "long patrol" demonstrated the effectiveness of small-unit raider tactics that would influence Marine special operations for decades.
The October Crisis: Puller and Basilone Hold the Line
By October, the Japanese had built their strength on Guadalcanal to over 20,000 troops. Lieutenant General Harukichi Hyakutake, commanding the Japanese Seventeenth Army, personally arrived to oversee what he planned as the final, decisive assault on Henderson Field. The attack was scheduled for the night of October 24.
The main Japanese effort struck the southern perimeter defended by the 1st Battalion, 7th Marine Regiment, commanded by Lieutenant Colonel Lewis "Chesty" Puller. Two full Japanese regiments. Nearly 7,000 troops. Attacked through the jungle in a driving rainstorm. The fighting lasted two nights. Japanese soldiers broke through the Marine wire in multiple places. Some reached the airfield itself. But Puller's battalion refused to give ground.
During the battle, Gunnery Sergeant John Basilone of the 7th Marines' weapons company performed one of the most celebrated acts of valor in Marine Corps history. Manning a section of heavy machine guns, Basilone kept his weapons firing throughout the night as Japanese troops surged against his position in waves. When ammunition ran low, he fought his way through enemy lines to resupply his guns. When one of his guns jammed, he cleared it under fire and resumed firing. When his position was nearly overrun, he used his pistol and fists to hold the line. Basilone was awarded the Medal of Honor. Sergeant Mitchell Paige, defending an adjacent sector, also received the Medal of Honor for similar actions that night.
The Battle for Henderson Field cost the Japanese over 3,000 killed. The 1st Battalion, 7th Marines lost 26 killed and 50 wounded. Puller received his third Navy Cross. The October attacks were the last major Japanese attempt to retake Henderson Field by ground assault.
The Army Arrives
By mid-October, the Marines were exhausted. Malaria, dysentery, malnutrition, and constant combat had degraded the 1st Marine Division to a fraction of its fighting strength. Reinforcements had been trickling in for weeks, but the first major Army unit to arrive changed the dynamic.
The 182nd Infantry Regiment of the Americal Division landed on October 13. During the Battle for Henderson Field on October 24 to 25, soldiers of the 164th Infantry Regiment reinforced Puller's Marines on the perimeter. It was the first time in the campaign that Army and Marine units fought side by side. The Army troops performed well under fire, feeding companies directly into the Marine lines during the height of the Japanese assault.
Through November and December 1942, additional Army units arrived. The rest of the Americal Division came ashore, followed by the 25th Infantry Division, including the 27th Infantry Regiment and the 161st Infantry Regiment. Elements of the 2nd Marine Division, including the 2nd Marine Regiment and 8th Marine Regiment, also reinforced the island. By late December, the U.S. garrison exceeded 50,000 troops.
On December 9, 1942, the battered 1st Marine Division was finally relieved. The division had been on Guadalcanal for four months. Vandegrift received the Medal of Honor. His Marines had held the island against everything the Japanese threw at them. Sea, air, and land. They left behind 774 Marines killed in action, over 1,960 wounded, and thousands more evacuated with malaria and tropical disease.
Iron Bottom Sound: The War at Sea
The naval battles around Guadalcanal were some of the most violent surface engagements of the entire war. The waters between Guadalcanal and the Florida Islands earned the name Iron Bottom Sound because of the sheer number of ships resting on the bottom. Both sides lost over 20 warships in the campaign. Combined casualties at sea exceeded 5,000 on each side.
The major naval engagements included the Battle of Savo Island on August 9, the Battle of the Eastern Solomons on August 24, the Battle of Cape Esperance on October 11, the Battle of the Santa Cruz Islands on October 26, the Naval Battle of Guadalcanal from November 12 to 15, and the Battle of Tassafaronga on November 30.
The Naval Battle of Guadalcanal in mid-November was the turning point at sea. Over three days, the U.S. Navy stopped a major Japanese reinforcement convoy, sank two Japanese battleships, and lost two American rear admirals killed in action. Rear Admirals Daniel Callaghan and Norman Scott both died in surface actions during the battle. They were the only two U.S. Navy admirals killed in surface combat during the entire war. The battle cost the Japanese eleven transport ships carrying 7,000 reinforcements. Most of those troops never reached the island.
After the Naval Battle of Guadalcanal, the Japanese were never again able to challenge American naval superiority in the southern Solomons. The Tokyo Express. The fast destroyer runs that had been smuggling troops and supplies to Guadalcanal under cover of darkness. Was effectively shut down.
The Final Push: January to February 1943
In January 1943, command on Guadalcanal passed to Major General Alexander Patch of the Americal Division, who was promoted to command the newly formed XIV Corps. Under Patch, American forces went on the offensive for the first time since the initial landings. The 25th Infantry Division, the Americal Division, and elements of the 2nd Marine Division pushed west along the coast, driving the Japanese toward Cape Esperance on the island's northwestern tip.
The Japanese fought stubborn rearguard actions, but they were starving, disease-ridden, and running out of ammunition. Imperial General Headquarters in Tokyo made the decision to evacuate. In early February, Japanese destroyers conducted three nighttime evacuation runs, pulling approximately 11,000 surviving troops off the island. On February 9, 1943, American forces reached the western coast and Guadalcanal was declared secure.
The Butcher's Bill
The numbers tell part of the story. Approximately 1,600 Americans were killed in ground combat on Guadalcanal. Another 4,900 sailors died in the naval battles. The Japanese lost approximately 31,000 troops. 14,800 killed in ground combat, 9,000 dead from disease and starvation, and over 3,500 killed at sea. The Japanese also lost 38 warships and transports, over 680 aircraft, and irreplaceable numbers of trained pilots.
But the numbers do not capture what Guadalcanal meant. It was the first time in the Pacific War that American ground forces had gone on the offensive. It was the first time the Japanese military had been defeated in a sustained land campaign. It shattered the myth of Japanese invincibility. And it proved that American Marines and soldiers could fight and win in the worst conditions imaginable. Jungle heat, tropical disease, short rations, no sleep, constant bombardment, and an enemy who would rather die than surrender.
The Legacy
The 1st Marine Division received the Presidential Unit Citation for Guadalcanal. The campaign produced five Medal of Honor recipients from the ground fighting alone, including Vandegrift, Edson, Basilone, Paige, and Sergeant John D. Munro of the Coast Guard. Guadalcanal transformed the 1st Marine Division from an untested formation into the most battle-hardened division in the Marine Corps. A reputation they would carry through Cape Gloucester, Peleliu, Okinawa, Korea, Vietnam, and Iraq.
For the Japanese, Guadalcanal was the beginning of the end. The losses in aircraft, ships, and trained personnel could not be replaced. Every month that the campaign dragged on, the balance of industrial production tilted further toward the United States. After Guadalcanal, the Japanese would never again attempt a major offensive in the Pacific. The rest of the war would be fought on their shrinking perimeter.
Guadalcanal proved something else. Something that the Marines who fought there understood before anyone else did. In the Pacific, the war was going to be won on the ground, island by island, against an enemy who had to be killed in his fighting positions because he would not quit. The campaign lasted six months. The lessons it taught lasted the rest of the war.
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