What steps did the Britain take …

In 1857 a sepoy mutiny broke out in East India that became a mass uprising in many parts of the country. The Company had faced rebellions in the past too, but not of this magnitude and extent. The British rulers realised that unless the rebellions are suppressed, their empire was destined to fizzle out. They took swift measures to put down the flame of the rebellion, some were of military nature while others were of political nature.
The important measures taken by the British to suppress the rebellion are as follows:

1. The imposition of Marshal Law and large scale of execution: In north India where rebels were holding ground. Marshal Law was imposed. Apart from enforcing the law, military officers also had the power to dispense justice and pronounce conviction and punishment without trial. The punishment was not Just swift, cruel and partisan but in most cases execution. The people were blown up by canons, still, others were hanged by trees. The objective was to terrorize the people and make them subservient to the might of the British empire.
2. Diplomacy: The British masters used diplomacy as a tool to weaken and destroyed the rebellions. They tried to win the support of native kingdoms who were not on the side of rebels, by promising them rewards and securing their kingdoms. The communities who were not involved in the mutiny, viz. Sikhs were recruited and sent to fight the rebels.
3. Use of technology: The British used technology to get an upper hand in the battlefields. Apart from having superior weapons, it was the superior communication system that routed the rebels. The company used telegram to instantly communicate with others, the rebels were totally clueless about such things.