History of the Integration of Jammu and Kashmir with India
To understand why Jammu & Kashmir, being a State included in the First Schedule of the Constitution of India, should yet be accorded a separate treatment, a retrospect of the development of the constitutional relationship of the State with India becomes necessary. Under the British regime, Jammu & Kashmir was an Indian State ruled by a hereditary Maharaja. On the 26th of October, 1947, when the State was attacked by Azad Kashmir Forces with the support of Pakistan, the Maharaja (Sir Hari Singh) was obliged to seek the help of India, after executing an Instrument of Accession similar to that executed by the Rulers of other Indian States. By the Accession the Dominion of India acquired jurisdiction over the State with respect to the subjects of Defence, External Affairs and Communications, and like other Indian States which survived as political units at the time of the making of the Constitution of India, the State of Jammu & Kashmir was included as a Part B State in the First Schedule of the Constitution of India, as it was promulgated in 1950.