dec 3, 1971 - Bangladesh Liberation War 1971

Description:

Operation Searchlight was conducted and following it and the Bangladesh atrocities almost 10 million Bengalis came back to India and settled as refugees.
India then intervened into the Bangladesh Liberation Movement and Pakistan made the mistake of conducting a pre-emptive strike on India. This was when the war between India and Pakistan began again.
Indian army captured Pakistan's territory till about 15000 square kilometres. This land gained in Pakistan Kashmir, Pakistani Punjab and Sindh sectors was gifted back to Pakistan in the Shimla Agreement later.

Added to timeline:

Date: