U.S. Marine Raiders gathered in front of a Japanese dugout on Cape Totkina on Bougainville, Solomon Islands.
Carlson's patrol, also known as The Long Patrol or Carlson's long patrol, was an operation by the 2nd Marine Raider Battalion under the command of Evans Carlson during the Guadalcanal Campaign against the Imperial Japanese Army from 6 November to 4 December 1942. In the operation, the 2nd Raiders attacked forces under the command of Toshinari Shōji, which were escaping from an attempted encirclement in the Koli Point area on Guadalcanal and attempting to rejoin other Japanese army units on the opposite side of the U.S. Lunga perimeter.
In a series of small unit engagements over 29 days, the 2nd Raiders killed almost 500 Japanese soldiers while suffering only 16 killed, although many were afflicted by disease. The raiders also captured a Japanese field gun that was delivering harassing fire on Henderson Field, the Allied airfield at Lunga Point on Guadalcanal.
Map of Carlson's patrol, from Aola to the Lunga perimeter.
At first light on 6 November, Carlson and his command group, two of his companies, and a group of native scouts and carriers commanded by Major John Mather of the Australian Army and Sergeant Major Jacob C. Vouza of the Solomon Islands Police Force set out from Aola on the patrol. The group marched along a jungle trail northwest to the Reko River, arriving on 7 November. At the Reko, Carlson learned that the local Christian mission had recently been raided by Japanese troops who had killed two of the missionaries before moving west. Pushing across the river with one platoon of troops, Carlson encountered a small group of Japanese who shot and severely wounded the native scout leading the Marine column. Returning fire, the Marines killed two Japanese soldiers and drove off another three or four. Carlson's main body then arrived and the column bivouacked for the night.
On 8 November, the column continued through the jungle to the northwest, striking the coast at the Kena River, and overnighted at the village of Tasimboko, 15 mi (24 km) from Aola Bay. The next day they crossed the Berande and Balasuna rivers and reached the village of Binu—10 mi (16 km) southwest of Tasimboko—in the afternoon. At Binu, about 3 mi (4.8 km) southeast of Koli Point, Carlson established his base camp and prepared to block the movement of any Japanese forces from Koli to the east and south.
The other three raider companies arrived at Aola on 8 November. On 9 November, they moved by landing craft to Tasimboko and, on 10 November marched overland—guided by native scouts—toward Binu. On the way, the raiders encountered a small group of Japanese soldiers and killed three of them before arriving at Binu in the afternoon of the same day.
In the meantime, Hyakutake ordered Shōji to abandon his positions at Koli and rejoin Japanese forces at Kokumbona in the Matanikau area. Although American forces had almost completely encircled Shōji's troops along Gavaga Creek at Koli, a gap existed by way of a swampy creek in the southern side of the American lines. Taking advantage of this route, Shōji's men began to escape. The Americans closed the gap in their lines on 11 November, but by then Shōji and between 2,000 and 3,000 of his men had escaped into the jungle to the south.
On 11 November, Carlson sent four of his battalion's companies—"C", "D", "E", and "F"—to fan out and patrol the area to the north and west of Binu. The remaining company, "B", stayed behind to provide security for the Binu base camp. At 10:00, Company C, which had marched directly west toward the village of Asamana, encountered a large body of Shōji's troops camped near the Metapona River and were quickly pinned down by rifle, machinegun, and mortar fire. Carlson responded by directing Companies D and E to come to C's aid, attacking the Japanese forces from two different directions.
A Marine officer briefs raider troops during the patrol.
As Companies D and E moved in C's direction, both encountered large concentrations of Shōji's soldiers and, by 12:30, were involved in intense firefights. At 15:00, Company D commander Captain Charles McAuliffe—with nine of his men—unexpectedly marched into the Binu base camp. McAuliffe reported to Carlson that soon after he had made contact with the Japanese forces, he and one of his squads had become cut off from the rest of his company. After extricating themselves with difficulty, McAuliffe and the men with him had decided to retreat back to the base camp. McAuliffe reported that, as far as he knew, the rest of his company had been annihilated. A short time later, however, the rest of D Company arrived at the base camp, led by Gunnery Sergeant George Schrier, after successfully disengaging from the firefight. Carlson summarily relieved McAuliffe for what he later described as "total ineptitude for leadership in battle" and placed Captain Joe Griffith in command of Company D.
Along with Company F, which had returned to the base camp, Carlson proceeded to the area where Company C was engaged, arriving at 16:30. Carlson ordered Company F to attack the Japanese positions facing Company C at 17:15. In the meantime, the Japanese troops departed the area, which Company F soon confirmed. Leaving Company F at the scene, Carlson returned to Binu with Company C, arriving at 22:00. Company E arrived at Binu about the same time and reported that they had caught a Japanese company crossing a river in the open and killed many of them before withdrawing. Carlson then took Company B and returned to the area that Company F was guarding, arriving at daybreak on 12 November. The Marines had suffered 10 killed in the day's actions and estimated that they had killed 120 Japanese soldiers.
Carlson and the two companies, with Company B leading, marched west towards the village of Asamana on the Metapona River. While crossing the river, the Marines captured two Japanese soldiers and killed a third who happened by in a native boat, then attacked and occupied Asamana, surprising and killing several Japanese soldiers in the village. Signs in Japanese in the village indicated that it was being used as a rallying location for Shōji's forces. Occupying defensive positions around the village and river crossing, the raiders killed 25 Japanese soldiers that approached the village during the remainder of the day.
Carlson's raiders cross an open field during the patrol.
The next day, when a company-sized column of Japanese soldiers approached Asamana, the raiders called in 75 mm (2.95 in) artillery fire from the 1st Battalion, 10th Marine Regiment, killing many of the Japanese and causing the rest to scatter and retreat away from the village. Carlson and the Marines with him returned to Binu on 14 November to rest and reprovision. In the same day, a patrol from the raiders Company F wiped out a 15-man Japanese encampment discovered by the native scouts.
On 15 November, Carlson's battalion changed their base camp from Binu to Asamana. By this time, however, Shōji's units were no longer in the area, having continued their march deep into the interior of Guadalcanal en route to the Matanikau. Raider patrols around Asamana over the next two days found and killed a few scattered Japanese stragglers.