Teishin Shudan

Also known as: 1st Raiding Group — the English rendering of the Japanese record's unit name · 第1挺進集団 (Dai-1 Teishin Shūdan) — the Japanese order-of-battle styling of the formation ([Japanese Wikipedia — 第1挺進集団](https://ja.wikipedia.org/wiki/第1挺進集団 "第1挺進集団 (Dai-1 Teishin Shūdan, 1st Raiding Group) — Japanese Wikipedia")) · Raiding Group — the literal English translation of 挺進集団 carried by the English article ([Wikipedia — Teishin Shudan](https://en.wikipedia.org/wiki/Teishin_Shudan "Teishin Shudan — Wikipedia")) · Ran (鸞) — the formation's codename, code designation RD ([Japanese Wikipedia — 第1挺進集団](https://ja.wikipedia.org/wiki/第1挺進集団 "第1挺進集団 (Dai-1 Teishin Shūdan, 1st Raiding Group) — Japanese Wikipedia"))

The Bataan pass, the Cyclone division, the raiding group, and Ka Fort

Definition

The Teishin Shudan (挺進集団, “Raiding Group”) was the Imperial Japanese Army’s division-level airborne force — a special-forces formation of the army’s air arm whose paratroop brigades were organized at Karasehara Airfield, Kyūshū, as “the first division-level raiding unit,” with an estimated 5,575 personnel: a headquarters company, an aviation brigade, a raiding brigade, two glider infantry regiments, and raiding artillery, signals, and engineer companies, commanded by a major general. (Wikipedia — Teishin Shudan) The Japanese record carries the same formation as 第1挺進集団 (Dai-1 Teishin Shūdan, the 1st Raiding Group) — Japan’s “first and only division-scale army airborne unit,” established November 30, 1944 by abolishing the Army Raiding Training Unit, codename Ran (鸞), code designation RD, under Major General Rikichi Tsukada; and it is the 1st Raiding Group that the English record sends to war: “Two regiments of Teishin Shudan were formed into the 1st Raiding Group, commanded by Major General Rikichi Tsukada under the control of the Southern Expeditionary Army Group, during the Philippines campaign.” (Japanese Wikipedia — 第1挺進集団, Wikipedia — Teishin Shudan)

The group’s Philippine war is the record this wiki’s Kembu Group and Rikichi Tsukada entries carry. Some 750 of its men, “mainly from the 2nd Raiding Brigade,” flew the December 6, 1944 raid on the Leyte airfields and were annihilated after some 300 reached Burauen; about half its embarked strength died when the carrier Unryū was sunk on December 19, 1944; the headquarters landed at San Fernando, La Union on December 29; and the formation became the core of the Kembu Group of about 30,000 for the Clark defense — broken in late January 1945, withdrawn to the slopes of Mount Pinatubo, and reduced to roughly a hundred survivors by the surrender, within the campaign’s 2,000 survivors of the 30,000. (Wikipedia — Teishin Shudan, Japanese Wikipedia — 第1挺進集団, Wikipedia — Battle of Luzon) The formation stands in the Fourteenth Area Army’s roster as the “special forces division” of the Luzon defense, and was disbanded in 1945. (Wikipedia — Fourteenth Area Army, Wikipedia — Teishin Shudan)

Identities

Source Type	Identity
Wikipedia	Teishin Shudan — English article verified this session; also carried in German, Spanish, French, Italian, Japanese, Korean, and Russian per the linked-data sitelinks (Wikipedia — Teishin Shudan, Wikidata — Q4101902)
Wikidata	Teishin Shudan (Q4101902) — “Japanese military unit”; instance of airborne division; founded 1944, dissolved 1945; eight Wikipedia sitelinks (verified this session) (Wikidata — Q4101902)
DBpedia	N/A — dbpedia.org data endpoint unreachable this session (ETIMEDOUT)
ProductOntology	N/A
Wiktionary	paratrooper — noun: “a type of soldier who is trained to enter combat zones by parachuting from aircraft” (verified this session) (Wiktionary — paratrooper)
Library of Congress Subject Headings (LCSH)	N/A — id.loc.gov unreachable this session (HTTP 403)
MeSH	N/A
NCBI Taxonomy	N/A
AGROVOC	N/A
Google Scholar	Teishin Shudan 挺進集団第1挺進集団 1st Raiding Group Rikichi Tsukada Karasehara Palembang February 1942 glider infantry regiment Ku-8 Unryu December 19 1944 Burauen Leyte raid December 6 1944 Ki-57 San Fernando December 29 Kembu Group Clark Field Mount Pinatubo Takachiho force Balete Pass Giretsu Okinawa airborne division dissolution 1945
ConceptNet	N/A
OpenCyc	N/A

Also Known As

1st Raiding Group — the English rendering of the Japanese record’s unit name
第1挺進集団 (Dai-1 Teishin Shūdan) — the Japanese order-of-battle styling of the formation (Japanese Wikipedia — 第1挺進集団)
Raiding Group — the literal English translation of 挺進集団 carried by the English article (Wikipedia — Teishin Shudan)
Ran (鸞) — the formation’s codename, code designation RD (Japanese Wikipedia — 第1挺進集団)

Examples and Analogies

An airborne division that finished the war on foot: the group’s paratroopers and glider infantry — with their own tank unit of four Type 95 Ha-Go light tanks from July 1943 — reached Luzon by transport ship, garrisoned Clark Field, and died as mountain infantry in the Pinatubo foothills: the standard case of an airborne establishment consumed as ground troops. (Wikipedia — Teishin Shudan, Japanese Wikipedia — 第1挺進集団)
A division that was never a division in the field: the English record’s own caution — its regiments “had manpower equivalent to a standard infantry battalion,” it lacked artillery, and its men “were no longer parachute-trained, but relied on aircraft for transport”; the Japanese record adds that it was never employed as a unified formation at all. (Wikipedia — Teishin Shudan, Japanese Wikipedia — 第1挺進集団)
The Palembang inheritance: the army’s first combat drop — February 14, 1942 at Palembang, Sumatra, where 425 men of the 1st Parachute Raiding Regiment took the airfield and the 2nd Regiment the town and refinery — was the doctrine the 1944 raid tried to repeat against airbases it could no longer reach. (Wikipedia — Teishin Shudan)
Verified order-of-battle data:
Formation: established November 30, 1944 (headquarters ordered November 26) from the abolished Army Raiding Training Unit; commander Tsukada Rikichi, November 1944 to the war’s end (Japanese Wikipedia — 第1挺進集団)
Components: 1st Raiding Brigade (1st and 2nd Raiding Regiments), 2nd Raiding Brigade (3rd and 4th), 1st Raiding Flying Group (transport squadrons of about 27 Type 100 transports each, a glider squadron, three airfield companies), 1st and 2nd Glider Infantry Regiments, 1st Raiding Tank Unit, and machine-gun, engineer, signal, and maintenance units (Japanese Wikipedia — 第1挺進集団)
Leyte raid: about 750 men, mainly of the 2nd Raiding Brigade, flown in Ki-57 transports on the night of December 6, 1944 against air bases on Luzon and Leyte; most aircraft shot down, some 300 landing near Burauen and annihilated (Wikipedia — Teishin Shudan)
Unryū: roughly half the group’s embarked troops sunk with the carrier on December 19, 1944; the flying group’s headquarters lost with a transport on December 7 (Japanese Wikipedia — 第1挺進集団)
Luzon: headquarters ashore at San Fernando December 29, 1944 with only the 2nd Glider Infantry Regiment, the machine-gun unit, and most of the signal unit; core of the Kembu Group (about 30,000, mostly aviation personnel); broken at Clark in late January 1945; withdrawn to the Pinatubo foothills (Japanese Wikipedia — 第1挺進集団, Wikipedia — Battle of Luzon)
Dispersal: the 2nd Raiding Brigade’s ~500 remnants plus 120 airfield-company men fought as the Takachiho force at Balete Pass; the engineers built roads at Baguio under the 14th Area Army; the homeland 1st Raiding Brigade’s Giretsu Airborne Unit raided Okinawa (Japanese Wikipedia — 第1挺進集団)
End: roughly 100 survivors with Tsukada (about 400 in one participant’s account), within the campaign-level 2,000 of 30,000 Kembu survivors; disbanded 1945 (Japanese Wikipedia — 第1挺進集団, Wikipedia — Battle of Luzon, Wikipedia — Teishin Shudan)

Usage Scenarios

1. Studying the Japanese Airborne Establishment

The group is the English-language entry point to the IJA’s airborne arm — the late-1930s program, the 1940 German example, the Palembang drop of 1942, the glider-tank experiments of 1943, and the doctrine of raiding airfields that the December 1944 Leyte operation applied to its own destruction. (Wikipedia — Teishin Shudan)

2. Working the Japanese Side of the Battle of Luzon

The group fixes the Japanese order of battle for the central-Luzon front: as the Kembu Group’s core it connects the Clark fighting to the Nagayoshi Detachment’s isolated stand at ZigZag Pass, “nominally under General Tsukada, Kembu Group commander.” (Wikipedia — Battle of Luzon, CMH — Back to Bataan)

3. Tracing the Fourteenth Area Army’s Roster

The formation is the raiding entry in the area army’s order of battle — listed among the August 15, 1945 components of the force that “suffered over 350,000 casualties” in the 1944–45 campaign, the roster this wiki’s Imperial Japanese Army entry carries. (Wikipedia — Fourteenth Area Army)

4. Comparing Airborne Doctrines

Against the Allied airborne divisions it nominally paralleled, the group is the cautionary comparison: structured as a division but “deployed as elite light infantry,” its parachute capability spent, its gliders lost at sea, and its last trained commandos expended on a one-way Okinawa raid by the homeland Giretsu element. (Wikipedia — Teishin Shudan, Japanese Wikipedia — 第1挺進集団)

Strategies

Seize the airfield, not the beach: the group’s doctrine from Palembang forward was the coup de main against air bases — repeated at Burauen in December 1944 against an enemy who now owned the air over the drop zones. (Wikipedia — Teishin Shudan)
Commit the elite as the core of the last-ditch defense: Yamashita’s use of the group — the best-trained infantry in central Luzon made the nucleus of a 30,000-man mostly-aviation force at Clark — traded airborne quality for defensive staying power. (Japanese Wikipedia — 第1挺進集団, Wikipedia — Battle of Luzon)
Absorb the air arm’s ground strength: the Kembu Group’s 30,000 were mostly air-army personnel without aircraft; the raiding regiments and glider infantry were “the only real ground combat units.” (Japanese Wikipedia — 第1挺進集団)
Disperse when destroyed: after Clark, the remnants fought as guerrillas in the Pinatubo foothills while detached elements fought on — the Takachiho force at Balete Pass, the engineers at Baguio. (Japanese Wikipedia — 第1挺進集団)

Security and Safety Measures

The destruction ledger: the Leyte raid annihilated, roughly half the group lost with the Unryū, the Clark main body broken in January 1945, and roughly 100 survivors of the airborne core by the surrender — inside the campaign’s 2,000-of-30,000 Kembu accounting. (Japanese Wikipedia — 第1挺進集団, Wikipedia — Battle of Luzon)
Transport as the fatal dependency: the group could move only by sea or air, and both were lost — the Unryū at sea, the transports sunk, the airlift shot down over Leyte; the airborne force that cannot fly is infantry without an army’s support. (Japanese Wikipedia — 第1挺進集団, Wikipedia — Teishin Shudan)
The civilian boundary: no atrocity charge attaches to the formation in the verified carriers, though its Baguio engineers performed anti-guerrilla work under the 14th Area Army — the theater-wide accountability question this wiki’s Yamashita Trial entry carries. (Japanese Wikipedia — 第1挺進集団)
For researchers: do not conflate the Teishin Shudan (the division-level raiding group) with its subordinate 1st and 2nd Raiding Brigades or with the separate Giretsu Airborne Unit of the homeland raiding force; carry Tsukada’s rank by date (major general to March 1, 1945); and cite the survivor figures to their scopes. (Wikipedia — Teishin Shudan, Japanese Wikipedia — 第1挺進集団)

Historical Context

The Imperial Japanese Army built its airborne arm late — the program stirred by the German successes of 1940 — and first used it at Palembang in February 1942, the 1st Parachute Raiding Regiment having lost its equipment with the Meiko Maru near Hainan a month earlier. By 1943 the establishment had grown to division scale at Karasehara: paratroop brigades, glider infantry regiments, even a glider-borne tank troop; but such forces “suffered from a disproportionately high casualty rate,” and “for the most part, the Teishin Shudan was deployed as elite light infantry.” (Wikipedia — Teishin Shudan)

The Philippines destroyed it in stages. Organized as the 1st Raiding Group at the end of November 1944 under Tsukada, it lost its raiders over Leyte on December 6, half its strength with the Unryū on December 19, and its flying group’s headquarters to a torpedoed transport; the headquarters reached Luzon on December 29 with the 2nd Glider Infantry Regiment and small units, and was made the core of the Kembu Group for Clark. (Japanese Wikipedia — 第1挺進集団, Wikipedia — Teishin Shudan) XIV Corps reached the Clark area on January 23, 1945; the group took a devastating blow, withdrew to Pinatubo, and fought as guerrillas until the surrender — its detached remnants fighting at Balete Pass, its homeland brigade’s Giretsu commandos flying the one-way Okinawa raid — until the formation was disbanded with Japan’s demobilization in 1945. (Japanese Wikipedia — 第1挺進集団, Wikipedia — Battle of Luzon, Wikipedia — Teishin Shudan)

Challenges and Controversies

A Division in Name Only

The historiographical problem is the label: a “division” of 5,575 whose regiments mustered like battalions, without artillery or logistics, and whose Japanese record states plainly it never fought as a unified formation — the order-of-battle name overstates what the formation was. (Wikipedia — Teishin Shudan, Japanese Wikipedia — 第1挺進集団)

Which Name Carries Which Fact

The English article “Teishin Shudan” and the Japanese article 第1挺進集団 describe one formation with different dating — the English record’s division-level organization at Karasehara against the Japanese record’s establishment of the 1st Raiding Group on November 30, 1944 — and Wikidata dates the item’s founding to 1944; the variance is one of scope (the brigades existed earlier; the division-scale group dates from late 1944). (Wikipedia — Teishin Shudan, Japanese Wikipedia — 第1挺進集団, Wikidata — Q4101902)

The Leyte Raid’s Logic

The December 6, 1944 Burauen operation — several hundred men annihilated to destroy aircraft on Leyte airstrips — remains the argument it always was: a doctrine of raids whose cost the official mind accepted, or a symbolic expenditure of irreplaceable trained men; the sources record the result, not the reasoning. (Wikipedia — Teishin Shudan)

The Counting of the Dead

Roughly 100 survivors (a participant’s ~400), within the Kembu Group’s 2,000-of-30,000 — each figure counts a different body of men, and the corpus’s rule applies: cite the scope, do not reconcile silently. (Japanese Wikipedia — 第1挺進集団, Wikipedia — Battle of Luzon)