"My dear Maharaja Sahib,

Your Highness' letter dated 26 October has been delivered to me by Mr. V. P. Menon. In the special circumstances mentioned by your Highness my Government have decided to accept the accession of Kashmir State to the Dominion of India. Consistently with their policy thatin the case of any State where the issue of accession has been the subject of dispute, thequestion if accession should be decided in accordance with the wishes of the people of the State, it is myGovernment's wish that as soon as law and order have been restored in Kashmir and her soil cleared ofthe invader the question of the State's accession should be settled by a reference to thepeople.

Meanwhile in response to your Highness' appeal for military aid action has been taken today to send troops of the Indian Army to Kashmir to help your own forces to defend your territory and to protect the lives, property and honour of your people. My Government and l note with satisfaction that your Highness has decided to invite Sheikh Abdullah to form an interim Government to work with your Prime Minister.

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With kind regards, I remain,

Yours sincerely,
October 27, 1947.
Mountbatten of Burma."

https://www.mtholyoke.edu/acad/intrel/kasmount.htm