Tarawa

In 1943, U.S. forces advanced through the Central Pacific, continuing the offensive thrust aimed ultimately at the Japan's home islands. The plan of attack called for them to take the Gilbert Islands, then the Marshall's. For Operation Galvanic, the seizure of the Gilberts, the 5th Amphibious Corps under Marine Major General Holland M. "Howlin' Mad" Smith was chosen as the landing force. His Corps consisted of the 2d Marine Division under Major General Julian C. Smith and the Army's 27th Infantry Division, led by Major General Ralph C. Smith. The 2d Marine Division would take Tarawa, and the 27th Infantry Division would take Makin Atoll, 100 miles north of Tarawa on a line to the Marshalls.

The Gilberts were a vital first step in the Central Pacific campaign. Without them, land-based reconnaissance and combat planes could not reach the Marshalls. The Gilberts also offered Japanese-constructed airstrips and a shortened supply route to the south and southwest areas of the Pacific.

Tarawa Atoll, specifically Betio Island, was selected as the target of the main assault because it contained an airfield and the bulk of the Japanese defenses. The atoll, at no point higher than 10 feet above sea level, is a triangular string of long, narrow coral islands with Betio at the southwest corner. Surrounded by a barrier reef, Betio presented a serious challenge to amphibious landing craft which would hang up on the reef if there wasn't a sufficient depth of tide to allow them to cross.

Once across the reef, the 2d Division Marines would face formidable obstacles. According to naval historian Samuel Eliot Morison, the water around the island was rife with mines; barbed wire and barricades designed to divert landing craft into lanes that were heavily covered by artillery. The Japanese had hundreds of guns, among them a system of heavy machine guns protected by coconut logs, sand, concrete and armored plate; 14 coast defense guns, all with underground ammunition storage and fire control systems; 25 37mm and 75mm field guns in shelters that were immune to direct hits from all but the largest guns; and an unknown number of antiaircraft guns.

Japanese defenders on Betio also had built a system of bombproof shelters made of coconut logs braced with angle irons. The roofs of these shelters were at least 6 feet thick and covered over with sand, logs and corrugated roof. Only heavy-caliber armor piercing or other delayed-action shells could penetrate them. These shelters were also compartmented, so dim the defenders enjoyed protection from grenades and explosives. Altogether, the Japanese occupied 500 pillboxes, bunkers and other strong points on the snuff island. In the worlds of U.S. Army history, "Tarawa was the most heavily defended atoll that would ever be invaded by Allied foam in the Pacific."

American planners of Operation Galvanic wanted to take Betio quickly, before the Japanese could bring what were believed to be powerful submarine and air form into the arena. To preserve strategic surprise, they ruled out concentrated air and naval bombardment until immediately before the assault. On Nov. 17-18, planes and ships from the Navy's Southern Carrier Group bombed islands throughout the Gilberts to keep the enemy confused about where the assault would come. While these raids took out some of Betio's guns, the most significant benefit was that they caused the Japanese to shoot off ammunition. On Nov. 20, Betio's defenders had only 4,800 rounds of 75mm and 127mm antiaircraft ammunition, and 15,000 rounds of 13mm machine gun bullets.

The Marines landed Nov. 20, 1943, on Betio's northwest shore. The 2d Marine Division came up with the innovative idea of using logistical support amphibian tractors (LVTs) as assault craft. LVTs would be effective in crossing the island's hinging reef and manmade obstacles. Unfortunately, there were enough LVTs only for the first three assault waves. After that, unless the tide was right, the Marines would have trouble getting the remaining waves across the reef in Higgins boats (LCVPs), which had a draft of 3-1/2 feet.

Betio's northwest shore was divided into Red Beach 1, 2 and 3, respectively, from west to east, a 500-yard pier marked the boundary between Red Beach 2 and Red 3 and extended north into the lagoon just beyond the hmgmg reef. The short western side of the island was designated as Green Beach. The Marines hoped to land a three-battalion front on the Red beaches, sweep across the island (a total distance of about 600 yards), capture the airfield and pin the enemy down on the island's west end.

Sustained naval bombardment and carrier-based bomber strikes preceded the Marines. Terrain and communications problems made these less effective than needed, but Japanese gunners were stopped long enough to allow the first three assault waves to reach the beach relatively unscathed. The 2d Scout-Sniper Platoon led by 1st Lieutenant William D. Hawkins landed first. winning the pier from enemy snipers. Then, the first elements of the 3d Battalion, 2d Marines came in on Red Beach 1. On the left of their beach, at the boundary with Red Beach 2, was a Japanese strong point that raked the Marines coming in on the west side of Red 1 with machinegun fire. Once landed, the Marines on Red 1 would take 35-50 percent casualties. Red 3 was the next beach reached, by the 2d Battalion, 8th Marines. Part of this group got as far inland as the airstrip before the Japanese recovered from naval bombardment. They took only 25 casualties in landing.

The most violently opposed landing was that of 2d Battalion, 2n Marines on Red 2. Some of these troops were driven off course by machine gun and anti-boat fire and forced to land an Red 1. The remainder, who reached Red 2, managed to carve out a beachhead only about 50 yards deep. Once the first three assault waves were in, two waves of landing boats were set to follow. These carried additional troops, tanks and artillery. Unfortunately, the irregular tides in the Gilberts worked against the landing force, and there was not enough water depth over the reef for the landing boats to cross. Infantry and howitzer crews had to wade ashore with weapons and equipment.

These men suffered the worst casualties of D-day. The only cover from Japanese machine gunners and riflemen was the pier, many did not reach it. Many of those who did were separated from their units and chain of command, and were unable to move to their proper beaches. At this point, the momentum of the assault bogged down because the reef effectively barred the landing boats. The number of amtracs was being rapidly reduced, units were disorganized and communications were spotty. The fierce action on the beach did not stop for the Marines to regroup, establish command posts, move in supplies or carry out their wounded. In the words of one Marine historian, "[only] the grim determination of individual Marines, who simply kept coming, in spite of all the enemy could hurl at them, offset the confusion."

By evening, the Marines' situation was tenuous at best. Of about 5,000 men who had gone ashore, 1,500 were either killed or wounded. Marines held a perimeter about 700 yards wide and 300 yards deep at the base of the pier, and an area about 150 yards by 500 yards at the northwest tip of the island. Most believed that a Japanese counterattack was bound to come during the night. If it had, it may well have succeeded. Julian Smith said that the Japanese commander lost the battle of Tarawa that night by failing to attack. Historians speculate the Japanese counterattack did not come because Japanese communications had been severely damaged by naval gunfire.

D +1 Day

Early on the morning of Nov. 21, the 1st Battalion, 8th Marines, who had spent almost 20 hours in boats waiting to land, fought their way in to reinforce the beachhead on Red 1. Battalion casualties were severe: while wading ashore, the men took heavy machine gun fire from strong points on the beach, as well as intense sniper fire from Japanese hiding in the hulks of sunken craft along the reef.

The second day of fighting on Betio was a yard-by-yard struggle. By noon, Marines fighting from Red Beach 2 gained the southern coast of the island, cutting the Japanese defenders into two groups. Third Battalion, 2nd Marines on the western end of the island, supported by close naval gunfire and Sherman tanks (in their first combat deployment in the Pacific), succeeded in clearing all of Green Beach. This provided a secure beach for landing reinforcements and equipment.

With both beachheads expanded and the movement of reinforcements and supplies increased . Colonel David M. Shoup, the senior commander on the island, radioed Julian Smith in late afternoon that the Marines were winning. The unopposed landing of the 1st Battalion, 6th Marines at dusk on Green Beach gave Shoup his first fully intact, fully equipped infantry unit on the inland.

D + 2 Day

Early on the morning of Nov. 22, the Japanese defenders of Betio sent a final, desperate message. In part, the message said that their weapons had been destroyed, and they were amassing "a final charge" The charge did not come until nightfall. By that time the Japanese-held portion of Betio had diminished radically.
The Marines swept eastward. Sherman tanks, closely supported by infantry, demolition experts and flamethrowers, pounded enemy Pillboxes and bomb shelters. At the end of the day, Japanese still held strong points inland from Red Beach 1, at the eastern end of the airfield and at the eastern end of the island. Three times during the night Japanese counterattacks surged from the eastern end of the island against two companies of the 1st Battalion 6th Marines. Each time they were driven off with artillery, grenades, machine guns, rifles and bayonets. The destroyers Schroeder and Sigsbee also battered Betio's defenders. The next morning, 325 Japanese bodies were counted, but about 500 were believed still alive.

D + 3 Day

On the fourth day of battle, Nov. 23, the 3rd Battalion 6th Marines successfully stormed the eastern end of the island. 'The pocket of strong resistance behind Red Beach 1 was also eliminated. Of the estimated 2,800 members of the Japanese Special Naval Landing Force on Betio, only 17 survived to surrender. Of the additional 2,000 Korean construction troops, 129 survived. While the goal of clearing the remaining Japanese strongholds was being accomplished, Marine engineers and Navy Seabees (Construction battalions) worked to repair Betio's airstrip. At noon, a carrier-based plane landed there. Shortly after, Julian Smith declared the island secure

Strategically, the victory at Tarawa opened the way to the Marshall Island . Tactically, it established the amphibious assault as the method used thereafter to defeat Japan in the Pacific campaign.
Tarawa was the first major amphibious assault in the Pacific in which U.S. troops faced sustained opposition on the beach. The American people were deeply disturbed by reports of high casualties suffered by the 2d Marine Division (1,027 dead and 2,292 wounded). The high casualties were the cost of a direct assault against a determined and well-armed enemy. Inadequate preliminary bombardment, communications problems and inexperienced boat handlers who missed their landing destinations also played a part .

The Navy-Marine Corps team learned much from Tarawa and quickly applied this experience to other landings in the Central Pacific. Among the lessons learned at Tarawa were the need for naval gunfire of greater duration and accuracy, coordinated close air support, more LVTs and improved battle communications.