Celebrate Hyderabad Liberation Day on September 17. Learn how Hyderabad joined India in 1948, the role of Operation Polo , the Nizam, and the Razakars. September 13, 2023, marks the 75th anniversary of Operation Polo , a significant military action undertaken by the Indian Army in 1948 to integrate the princely state of Hyderabad. The Annexation of Hyderabad (code-named Operation Polo ) was a military operation launched in September 1948 that resulted in the annexation of the princely state of Hyderabad by India, which was dubbed a "police action". [9][10][11] About Operation Polo , India's military operation to annex Hyderabad, marking the end of Nizam's rule and the integration of the state into India in 1948.