Activated in World War I in France, the I Corps oversaw US Army divisions as they repelled several major German offensives and advanced into Germany.

[2] Assisted by the French XXXII Corps, the headquarters was organized and trained; on 20 January, Major General Hunter Liggett took command.

From February to July, 1918, the German Army launched four major offensives, attempting to secure victory before the full American forces could be mobilized.

The final offensive, started in July 1918, was an attempt to cross the Marne, in the area of Château-Thierry, but the I Corps and other formations on the American lines held, and the attack was rebuffed.

Headquarters, I Corps was fully activated 1 November 1940, less Reserve personnel, at 1429 Senate Street, Columbia, South Carolina, and assumed command and control of the 8th, 9th, and 30th Divisions.

The HHC were transferred to Fort Jackson, South Carolina, on 20 February 1941, once space for the corps headquarters became available on the post.

Stubborn resistance from two Australian brigades bought time for I Corps reinforcements to arrive while the terrain proved more difficult than the Japanese had anticipated.

[7] This force, later augmented by the Australian 7th Division, fought the Battle of Buna-Gona, slowly advancing north against a tenacious enemy under harsh weather and terrain conditions.

[7] That mission was the capture of Hollandia on the north coast of Dutch New Guinea; the units allocated to the corps for this task were the 24th and 41st Infantry Divisions.

[19] Following this accomplishment, the corps turned northward and began the systematic reduction of the enemy positions on the approach to the Cagayan Valley.

[26] The next few years were a period during which the terms of the surrender were supervised and enforced; Japanese military installations and material were seized, troops were disarmed and discharged, and weapons of warfare disposed of.

[27] By 1948, as the purely occupational mission was accomplished, troops of the corps focused more military training and field exercises designed to prepare them for combat.

The US Army continued a slow and steady process of post-war drawdown and demobilization on its own, and on 28 March 1950, the corps was formally inactivated in Japan, and its command consolidated with other units.

Four days later I Corps troops began a general offensive northward against crumbling KPA opposition to establish contact with forces of the 7th Infantry Division driving southward from the beachhead.

Major elements of the KPA were destroyed and cut off in this aggressive penetration; the link-up was effected south of Suwon on 26 September.

The Chinese People's Volunteer Army (PVA) entered the war on the side of North Korea, making their first attacks in late October.

By the end of October the city of Chongju, 40 miles (64 km) from the Yalu River border of North Korea, had been captured.

The Eighth Army suffered heavy casualties, ordering a complete withdrawal to the Imjin River, south of the 38th Parallel, having been destabilised by the overwhelming PVA forces.

[33] Between February and March, the corps participated in Operation Killer, pushing PVA forces north of the Han River.

[33] As I Corps troops approached the Iron Triangle formed by the cities of Cheorwon, Kumhwa and Pyonggang, PVA/KPA resistance increased.

[31] On 23 January 1953, the first major action of the year was initiated with a raid by the ROK 1st Infantry Division against the PVA/KPA's Big Nori positions.

In late May troops of the Turkish Brigade, attached to the 25th Infantry Division, defended the Nevada Complex in fierce hand-to-hand combat.

The ROK 1st Division troops were ordered off the positions on Queen, Bak and Hill 179 when heavy PVA/KPA assaults deprived them of their tactical value.

This caused a good deal of activity on Fort Lewis, as the post restructured itself to support the corps' new mission, and to insure that it had a smooth, rapid departure in case they were needed anywhere in the world.

[41] In preparation for these new requirements, Fort Lewis began to receive new corps support units which were coming out of Europe.

It coordinated the efforts of both of the active Stryker Brigade Combat Teams, attached engineers, civil affairs, signal, and other supporting units as well as Iraqi security forces, eventually numbering more than 12,000.

The I Corps Commander Lt. Gen. Robert Brown announced this Pacific Rim rebalance during his Change-of-Command Ceremony at Joint Base Lewis-McChord.

In late 2011, President Barack Obama and Secretary of Defense Leon Panetta signaled the Asia-Pacific pivot and made several trips to the region.

[49] The Pacific Rim Rebalance will involve several combined and joint military exercises in Japan, South Korea, Thailand, Philippines, and Australia.

Part of the I Corps' objectives for these exercises will be Joint Task Force certification in support of United States Pacific Command missions.