"Post Conflict Humanitarian Impact", is a case study of the emergency healthcare provided by Medecines Sans Frontieres in Karbi Anglong district of Assam in India. The author has evaluated the perceptions of MSF's intervention by the stakeholders of the conflict and to assess the achievement of MSFís project with respect to its planned objectives, as well as determining effectiveness of the implementation process.In 2005 ethnic conflict erupted between two tribes (Dimasa & Karbi) with a history of centuries of amicable coexistence. Militants from both the tribes indulged in killing of innocent people. The population fled to towns for protection. 50 relief camps were established to provide shelter and care to about 50,000 Internally Displaced Persons. MSF work has saved hundreds of lives with preventive and curative action. MSF worked fearlessly providing humanitarian service without discrimination of caste, creed, religion, community and region. However, a section of the population viewed the work of MSF with suspicion of having hidden agenda behind the relief work.The author has made some recommendations which would be pertinent to the humanitarian interventions.