Mangal Pandey, a Sepoy in the 34th Bengal Native Infantry, is credited with starting the Sepoy Mutiny on 29th March 1857 when he refused to use the new cartridges greased with animal fat. In the end, he shot a few British officers who were sent to arrest him for his disobedience.
This led to a chain of events that saw most of the Indian subcontinent up in arms against the East India Company.
For further reading check the following articles:
- Revolt of 1857, political and Economic Factors
- Revolt of 1857: Immediate Factor
- Revolt of 1857 Social Causes