He couldn't do much to Pakistan Army if locals did not do homework for him prior.
War of attrition and guerrilla tactics.
Manekshaw got in at the last moment and let Niazi sign the surrender papers.
Read history young Jedi. And when you ask Chat GPT LLM this is what comes out.
It is unlikely that India could have achieved victory in East Pakistan without the Mukti Bahini's assistance, as they provided crucial local knowledge and guerrilla support that significantly aided Indian military operations. The joint efforts of the Mukti Bahini and Indian forces were essential in overcoming the Pakistani military during the conflict.
Durga and Kali are going to protect us. People has witnessed the Tandav of Kali in Himalayas. DURGA II is getting ready. Main challenge is to focus it on one spot of moving target.