For the First World War corps, see I Corps (British India)

I Corps (British India)

for the current Indian Army formation see I Corps The I Indian Corps was an army corps of the British Indian Army in World War I. It was formed at the outbreak of war under the title Indian Corps from troops sent to the Western Front. The British Indian Army did not have a pre-war corps structure,...

I Corps is a military field formation of the Indian Army

Indian Army

The Indian Army is the land based branch and the largest component of the Indian Armed Forces. With about 1,100,000 soldiers in active service and about 1,150,000 reserve troops, the Indian Army is the world's largest standing volunteer army...

, created in 1965. It was still being raised when it was despatched to the front in 1965. It conducted a counteroffensive during the Indo-Pakistani War of 1965

Indo-Pakistani War of 1965

The Indo-Pakistani War of 1965 was a culmination of skirmishes that took place between April 1965 and September 1965 between Pakistan and India. This conflict became known as the Second Kashmir War fought by India and Pakistan over the disputed region of Kashmir, the first having been fought in 1947...

. In the 1971 war against Pakistan, it took part in the Battle of Basantar

Battle of Basantar

The Battle of Basantar or the Battle of Barapind was one of the vital battles fought as part of the Indo-Pakistani War of 1971 in the western sector of India...

.

During 1971 at least one source cites the corps

Corps

A corps is either a large formation, or an administrative grouping of troops within an armed force with a common function such as Artillery or Signals representing an arm of service...

 composition as:

• X Sector
• Indian 36th Infantry Division (8, 115 Brigades initially)
• 39th Infantry Division
• 54th Infantry Division

Today it is a 'Strike Corps' within the Indian Army's Central Command, headquartered at Mathura in Uttar Pradesh

Uttar Pradesh

Uttar Pradesh abbreviation U.P. , is a state located in the northern part of India. With a population of over 200 million people, it is India's most populous state, as well as the world's most populous sub-national entity...

. Central Command itself has its headquarters at Lucknow.

It consists of:

• 23rd Artillery Brigade
• 627 (I) Mechanised Air Defence Brigade
• Engineer brigade
• 4th Infantry Division (HQ Allahabad)
• 6th Mountain Division (Bareilly
  Bareilly
  Bareilly is a prominent city in Bareilly district in the northern Indian state of Uttar Pradesh. Standing on the Ramganga river, it is the capital of the Bareilly division and the geographical region Rohilkhand...
  
  )
• 33rd Armoured Division (Hissar
  Hisar, India
  Hisar city, previously spelled Hissar, is the administrative headquarters of Hisar district, in the state of Haryana, in northwestern India. Hisar was founded in 1354 CE, as Hissar-e-Firoza by Firoz Shah Tughlaq, who reigned over the Sultanate of Delhi from 1351 to 1388. on the demolished ruins...
  
  ) As of 1996, 8th Battalion, Brigade of the Guards
  Brigade of the Guards
  Brigade of The Guards is a regiment of the Indian Army. It is the first "All India" mixed "All Class" Composition Infantry Regiment of the Army where troops from all parts of India serve together in various battalions of the Regiment...
  
  , in a mechanised profile, was assigned to 57 Armoured Brigade of 33 Armoured Division.
• 40 Artillery Division (India), HQ Ambala Cantonment, Haryana
  Haryana
  Haryana is a state in India. Historically, it has been a part of the Kuru region in North India. The name Haryana is found mentioned in the 12th century AD by the apabhramsha writer Vibudh Shridhar . It is bordered by Punjab and Himachal Pradesh to the north, and by Rajasthan to the west and south...
  
  

88 Armoured Brigade appears to be in this area as well.