Where did Mangal Pandey refuse to use the greased cartridge?

Background: The British introduced new Enfield rifles in the army. The cartridges for these rifles had to be bitten open before loading, and they were rumored to be greased with cow fat (offensive to Hindus) and pig fat (offensive to Muslims).
The Incident: On 29 March 1857, at Barrackpore, Mangal Pandey openly defied the order to use these cartridges. He attacked British officers, urging fellow soldiers to rise against the injustice.
Significance:
His refusal and subsequent actions became one of the first sparks of the Indian Rebellion of 1857.
Though he was captured and executed on 8 April 1857, his defiance inspired widespread resistance across India.
Legacy: Mangal Pandey is remembered as one of the earliest martyrs of India’s freedom struggle, symbolizing resistance against colonial oppression.
Answer: Mangal Pandey refused to use the greased cartridge at Barrackpore cantonment, near Kolkata, in 1857.