Operation Polo, referred to as ‘Police Action’, was the five-day-long military operation undertaken by the Indian Union against the State of Hyderabad. The battle between India and Hyderabad began on 13th September 1948 and ended on 18th September 1948.
On 17th September 1948, the Ministry of Laik Ali resigned, and power was handed over to the Nizam. The Nizam sent a message through K.M. Munshi to the Indian Government, stating that he had ordered a ceasefire and the disbandment of the Razakars.
On the same day, the Nizam, in a broadcast to the people, declared that he had:
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Ordered ceasefire
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Given instructions for the withdrawal of the Hyderabad case from the UNO
Major-General J.N. Chaudhuri took charge as the Military Governor of Hyderabad State. He continued to oversee the administration, and M.K. Vellodi, ICS, was appointed as the Chief Minister.
The Nizam was given the status of a Rajpramukh.
Thus, the Hyderabad State officially became a part of the Union of India.