He played a leading role in the LTTE's military victories in the Vanni during Eelam War III, including Mullaitivu (1996), Kilinochchi (1998), Oddusuddan (1999) and Elephant Pass (2000).

[8] His younger brother Sivakumar (nom de guerre Kilman), who was in command of the Charles Anthony division in Trincomalee District, was killed in an accident in 1994.

[6] His cousin was Thileepan (alias Curdles or Kerdy), the LTTE's regional commander for Thenmarachchi.

[6] Theepan was then appointed military commander for Kilinochchi District where he carried many attacks against the Indian Peace Keeping Force (IPKF).

Balraj and Theepan led a number of successful operations against the Sri Lankan military in the Vanni including the capture of Mankulam and Kokavil in June/July 1990.

[6] Theepan helped defend Jaffna against the Sri Lankan military's Operation Leap Forward.

[6] In October 1995 the Sri Lankan military launched Operation Riviresa (Sun Rays) to re-capture the Jaffna peninsula.

[6] Theepan led the reconnaissance of the army camp in Mullaitivu prior to it being overrun by the LTTE in July 1996.

[6] In 1997 the Sri Lankan military launched Operation Jayasikurui (Certain Victory) aimed at clearing a land route to the Jaffna peninsula.

[9][10] The military launched Operation Agni Kheela (Ball of Fire) to re-capture the southern part of the Jaffna peninsula, particularly Elephant Pass.

Theepan was involved in heavy fighting as the LTTE battled to retain its dwindling territory.

[6] Theepan and his troops, together with other senior LTTE commanders, were surrounded by the military at Ananthapuram, Mullaitivu District.

[6] Bhanu, Lawrence and Keerthi broke out of the siege but Theepan refused to go, wanting instead to remain with his troops.

[6] Theepan's body was identified by a doctor in military custody who had previously treated his chest wounds.