X Corps (United States)

Also known as: X Corps · Tenth Corps — the numeral styling · X Corps (United States Army) — the disambiguated styling

Definition

X Corps is a corps of the United States Army — activated on May 15, 1942 at Sherman, Texas, under Major General Courtney H. Hodges — whose principal combat record was made in the liberation of the Philippines in World War II and whose second life came in the Korean War. (Wikipedia — X Corps) The corps the Philippines remembers is Sibert’s: commanded by Major General Franklin C. Sibert from August 1944 to November 18, 1945, it fought the Leyte campaign under the Sixth Army — landing October 20, 1944 with the 24th Infantry and 1st Cavalry Divisions, liberating Tacloban, and destroying the Japanese 1st Division rushed from Manchuria — then passed to the Eighth Army for the Battle of Mindanao, where it was “composed of the reinforced 24th and 31st Infantry Divisions,” landing them on Illana Bay on April 17, 1945 on beaches Wendell Fertig’s guerrillas had cleared. (Wikipedia — X Corps, Wikipedia — Franklin C. Sibert, CMH — Triumph in the Philippines) Slated for the invasion of Japan, it went instead into the occupation of southwestern Honshū and Shikoku from Kure, and was inactivated on January 31, 1946. (Wikipedia — X Corps, Wikipedia — Occupation of Japan)

For its Philippine service the corps received the Philippine Presidential Unit Citation with a streamer embroidered “17 October 1944 – 4 July 1945.” (Wikipedia — X Corps) Reactivated for Korea, it landed at Inchon in 1950 under Lieutenant General Edward M. Almond, fought to the Chosin Reservoir and out through the Hungnam evacuation, and held the war’s eastern front to the armistice; a postwar regional headquarters, it was inactivated on March 31, 1968 in the Army Reserve reorganization. (Wikipedia — X Corps) Military-history register: the World War II corps of the Philippine liberation — the headquarters at the center of this wiki’s Battle of Mindanao, Sibert, and Fertig entries. (Wikipedia — Battle of Mindanao, CMH — Triumph in the Philippines)

Identities

Source Type	Identity
Wikipedia	X Corps (United States)
Wikidata	X Corps (Q14480883) — “corps of the United States Army from 1942 to 1968”; enwiki sitelink X Corps (United States) (verified this session)
DBpedia	X_Corps_(United_States) — label verified on the data endpoint this session
ProductOntology	N/A
Wiktionary	corps — noun, the formation type the entry names (headword verified this session; no separate entry for the unit)
Library of Congress Subject Headings (LCSH)	N/A — no heading returned for the corps (verified this session; name authorities exist for adjacent corps, e.g., United States. Army. Corps, XI)
MeSH	N/A
NCBI Taxonomy	N/A
AGROVOC	N/A
Google Scholar	X Corps United States Army Sibert Leyte October 20 1944 Sixth Army Mindanao Eighth Army Illana Bay April 17 1945 24th 31st Infantry Division Kabacan Sayre Highway Fertig guerrillas Kure occupation January 31 1946 Inchon Chosin Hungnam
ConceptNet	N/A — ConceptNet API unreachable this session (HTTP 502)
OpenCyc	N/A

Also Known As

X Corps
Tenth Corps — the numeral styling
X Corps (United States Army) — the disambiguated styling

Examples and Analogies

The landing the guerrillas delivered: on April 13, 1945 “Colonel Fertig radioed Eighth Army that X Corps could land unopposed at Malabang and Parang,” and on April 15 — two days before the assault — “X Corps made sweeping changes in its attack plans,” cutting a prepared division assault to a walkover. (CMH — Triumph in the Philippines)
The junction that split an island’s defense: the Kabacan road junction seizure was “strategically, if not tactically, decisive in the eastern Mindanao campaign,” “hopelessly separating the 30th and 100th Divisions” for destruction in detail. (CMH — Triumph in the Philippines)
Verified corps data:
Activation and training: May 15, 1942, Sherman, Texas, Hodges commanding; Louisiana Maneuvers summer 1943; headquarters at Camp Maxey and Camp Young; to New Guinea summer 1944 aboard the Klipfontein (Wikipedia — X Corps)
Leyte: October 20, 1944 landing with the 24th Infantry and 1st Cavalry Divisions as main units; Tacloban liberated soon after; Japanese 1st Division destroyed in western Leyte (Wikipedia — X Corps)
Mindanao: Illana Bay April 17, 1945 (24th Division), the 31st over secured beaches April 22; an advance of 75 miles in three days; the 41st Division’s 162nd RCT lent by Eighth Army for the Davao fight (CMH — Triumph in the Philippines, Wikipedia — X Corps, Wikipedia — Battle of Mindanao)
Occupation: southwestern Honshū and Shikoku from Kure; inactivated January 31, 1946 (Wikipedia — X Corps, Wikipedia — Occupation of Japan)
Commanders: Hodges (May 1942–February 1943); Anderson (March 1943–July 1944); Sibert (August 1944–November 18, 1945); Clarkson (November 18, 1945–January 31, 1946); in Korea — Almond (August 26, 1950–July 15, 1951), then Byers, Palmer, White, and Clarke; final inactivation March 31, 1968, reserve units passing to the 124th Army Reserve Command (Wikipedia — X Corps)

Usage Scenarios

1. Studying the Leyte Landing

Order-of-battle work on October 20, 1944 pairs the corps with the Sixth Army’s landing plan — X Corps in the north with the 24th Infantry and 1st Cavalry Divisions, Tacloban’s liberation, and the winter destruction of the Japanese 1st Division. (Wikipedia — X Corps)

2. Analyzing the Mindanao Campaign

The corps is the organizing headquarters of the eastern Mindanao record this wiki’s Battle of Mindanao entry carries: the guerrilla-cleared Illana Bay landing, the two-division split at Kabacan, the Sayre Highway drive and the fight to Davao, and the lent 162nd RCT. (CMH — Triumph in the Philippines, Wikipedia — Battle of Mindanao)

3. Researching Guerrilla Integration

The corps is the test case of the two-army liberation: it rebuilt its landing plan on Fertig’s radioed intelligence, landed unopposed where a division assault had been drawn, and closed the campaign handing sectors east of the Sayre Highway to the guerrilla divisions. (CMH — Triumph in the Philippines)

4. Tracing the Liberation-to-Occupation Sequence

The Eighth Army that ran the Visayas and Mindanao campaigns became the occupation’s ground command, X Corps served at Kure, and Sibert’s command ended there on November 18, 1945 — weeks before the corps’s own inactivation. (Wikipedia — Occupation of Japan, Wikipedia — X Corps)

Strategies

Buy intelligence, land cheap: the corps’s low amphibious cost at Illana Bay rested on the guerrilla clearance of Malabang by April 11 and Fertig’s April 13 assurance. (CMH — Triumph in the Philippines)
Split the defenders at the junction: by driving to Kabacan where Route 1 met the Sayre Highway, the corps severed the Japanese 30th from the 100th Division and beat each separately — the eastern campaign’s decisive stroke. (CMH — Triumph in the Philippines)
Manage combat power across armies: when the Davao fight demanded the 21st Infantry, Eighth Army gave the corps the 41st Division’s 162nd RCT from the finished Zamboanga operation — one garrison, two fronts. (CMH — Triumph in the Philippines)
Convert liberators into garrisons: the corps slated for Coronet went instead to Kure — the same headquarters executing occupation duty until demobilization caught up. (Wikipedia — X Corps, Wikipedia — Occupation of Japan)

Security and Safety Measures

Landing security earned before H-hour: bombardment plus guerrilla-held beaches plus verified intelligence — amphibious security begins weeks before the boats. (CMH — Triumph in the Philippines)
The prepared rearguard on chosen ground: the northern axis paid for delays on prepared positions — the Maramag delaying action and the Mangima canyon fight that held the 31st Division’s regiments for days (Wikipedia — Battle of Mindanao, CMH — Triumph in the Philippines)
The map that outran the ground: the corps’s tentative envelopment down the Kibawe–Talomo trail died on guerrilla warnings that the trail was largely imaginary — cut to a battalion reconnaissance-in-force, the recorded correction of map-driven maneuver. (CMH — Triumph in the Philippines)
For researchers: keep the two inactivations distinct — January 31, 1946 (the World War II corps at Kure) and March 31, 1968 (the post-Korea reserve headquarters) — and the army assignments straight: Sixth Army at Leyte, Eighth Army in Mindanao; the Sibert-era record is what the Philippine Presidential Unit Citation streamer covers. (Wikipedia — X Corps, CMH — Triumph in the Philippines)

Historical Context

Activated at Sherman, Texas in May 1942 under Hodges, the corps trained through the 1943 Louisiana Maneuvers and reached the Southwest Pacific in summer 1944. (Wikipedia — X Corps) Sibert — the 6th Infantry Division’s commander fresh from the New Guinea fighting — took the corps in August 1944 and landed it at Leyte on October 20 as part of Krueger’s Sixth Army; the corps liberated Tacloban and spent the winter destroying the Japanese 1st Division in western Leyte. (Wikipedia — X Corps, Wikipedia — Franklin C. Sibert)

Reassigned south, the corps wrote its fastest chapter. On Fertig’s intelligence it changed its landing plan on April 15, 1945, put the 24th Division ashore at Illana Bay on April 17 and the 31st over the secured beaches on April 22, took the Kabacan junction with a river flotilla, and ran two drives — the 24th to Davao, the 31st up the Sayre Highway — while the guerrilla divisions took over the mop-up; Eichelberger reported organized resistance ended on June 30, 1945. (CMH — Triumph in the Philippines, Wikipedia — Battle of Mindanao) Slated for Operation Coronet, the corps instead crossed to a surrendered Japan — occupation duty from Kure, Sibert’s relief on November 18, 1945, inactivation on January 31, 1946. (Wikipedia — X Corps, Wikipedia — Occupation of Japan)

The second life was Korea: reactivated in 1950 under Almond — dual-hatted as MacArthur’s chief of staff — it landed at Inchon, went ashore again at Wonsan, and was strung along the Chosin Reservoir when the Chinese intervened, the 1st Marine Division and the shattered RCT 31 fighting out to the Hungnam evacuation completed December 24, 1950; after the war the corps settled into a regional-headquarters role at home until 1968. (Wikipedia — X Corps)

Challenges and Controversies

Which Army Ran the Corps

The corps’s Philippine record splits at the army seam — Sixth Army at Leyte, Eighth Army at Mindanao — and accounts that merge the two misattribute both the Illana Bay decision (the Eighth Army’s) and the corps-level execution (Sibert’s April 15 changes, the Kabacan split), the caution this wiki’s Sibert entry registers. (Wikipedia — X Corps, CMH — Triumph in the Philippines)

Credit Between Corps and Guerrillas

The unopposed landing and the seventy-five-mile advance were bought by Fertig’s 10th Military District — the intelligence, the cleared beaches, the wrecked road net — and accounts that hand the feat to the corps alone erase the Filipino formations the official history names at every decision point. (CMH — Triumph in the Philippines, Wikipedia — Battle of Mindanao)

The Korea Command Controversy

After Inchon the corps “remained outside of the direct command of Eighth Army too long,” reporting to MacArthur while Almond doubled as his chief of staff — criticized as favoritism and blamed for the dispersed deployment that RCT 31’s destruction at Chosin exposed. (Wikipedia — X Corps)

Two Inactivations, One Name

Lists and lineage charts confuse the January 31, 1946 inactivation of the World War II corps at Kure with the March 31, 1968 inactivation of the reserve-era headquarters — twenty-two years apart. (Wikipedia — X Corps)