Emergencies have been declared in India 3 times –
1962-1968: External aggression during the Indo-China war
1971-1977: External Aggression during the Indo-Pakistan war
1975-1977: Extension of the previous emergency on grounds of internal disturbances

States of Emergency and the Law: The Experience of Bangladesh

The second emergency was originally proclaimed during the Indo-Pakistan war, was later extended along with the third proclamation between 25 June 1975 to 21 March 1977 under circumstances of political instability under Indira Gandhi's prime ministership, when "the security of India" was declared as being "threatened by external aggression". The phrase Emergency period used loosely, when referring to the political history of India, often refers to the third and the most controversial of the three occasions.