Indian Rebellion of 1857

The Indian Rebellion of 1857, also called the Great Indian Event of 1857, the Indian Mutiny, the Sepoy Mutiny, India's First War of Independence or India's First Struggle for Independence, began on 10 May 1857 at Meerut as a mutiny of sepoys of the British East India Company's army. Sepoys in the Presidency of Bengal revolted against their British officers.
Causes.
The causes of the mutiny are hard to pin down, and have been much argued about. Before the Rebellion, there were 50,000 British troops, and 300,000 Sepoy serving in the East India Company military. 
The forces were divided into three presidency armies: Bombay, Madras, and Bengal. The make-up of these armies varied from region to region.
The Bengal Army recruited higher castes, such as Rajputs and Bhumihar brahmins. They cut back the enlistment of lower castes in 1855. In contrast, the Madras Army and Bombay Army were "more localised, caste-neutral armies" that "did not prefer high-caste men". The domination of higher castes in the Bengal Army has been blamed in part for initial mutinies that led to the rebellion.
There were some changes in the terms of their service which may have created resentment. As the East India Company expanded, soldiers were now expected to serve in less familiar regions, such as in Burma, and also to make do without the "foreign service" remuneration they had got previously. Another financial grievance stemmed from the general service act, which denied retired sepoys a pension. This applied only to new recruits, but older sepoys suspected that it might bied apply to those already in service. Also, the Bengal Army was paid less than the Madras and Bombay Armies, which increased their fears over pensions.
Flash point.
The immediate event which angered the sepoys was about the ammunition for the new rifles they had to use were Enfield rifles. The cartridges that were used in the new rifles had to be bitten open. The Muslims were angry because they thought that the paper cartridges had pig fat in them. This was because Muslims believe that pigs are unclean. Hindu soldiers were angry because they believed the cartridges had cow fat in them. On January 27, Colonel Richard Birch ordered that no cartridges should have grease on them, and that sepoys could grease them with whatever they wanted.
During the 1850s the British rulers continued to forcibly take some regions, ruled by Indians and made these regions (for example: the kingdom of Agra and Oudh, part of the present day Indian state of Uttar Pradesh, which was seized in 1856) part of the British kingdom. Lord Dalhousie was the Governor General who decided to do this which was against Hindu customs. They did not give any respect to old royal houses of India like the Mughals (nominally Emperors of India) and the Peshwas (the most powerful of the Maratha rulers, leaders of the Maratha Confederacy).
Events.
Rebellion broke out after a soldier, called Mangal Pandey, attacked a British sergeant and wounded an adjutant while his regiment was in Barrackpore. General Hearsey ordered another Indian soldier to arrest Mangal Pandey, but the soldier refused. Later, the British arrested Mangal Pandey and the other Indian soldier. They hanged both of them for treachery. All other soldiers of that regiment lost their places in the army. On May 10, 1857, cavalry troops while doing parade at Meerut broke ranks. They freed the soldiers of the 3rd regiment and moved towards Delhi. Soon, many Indians of northern India joined the soldiers. They entered the Delhi Fort, where Mughal Emperor Bahadur Shah II lived, and asked him to become leader of the rebellion. He agreed unwillingly. Very soon, the revolt spread throughout northern India. Important Indian leaders of royal families joined the rebellion and started fighting the British at several places. The leaders included Ahmed Ullah, an advisor of the ex-King of Oudh; Nana Saheb, his nephew Rao Saheb, and his retainers, Tantia Tope and Rani Lakshmibai; the Rani of Jhansi; Kunwar Singh; the Rajput chief of Jagadishpur in Bihar; and Firuz Saha, a relative of the Mughal Emperor, Bahadur Shah.
At first, the British were slow to respond. However, they later took very quick action with heavy forces and brought their regiments from the Crimean War to India. They also redirected many of the regiments that were going to China to India. The British forces reached Delhi and surrounded the city from July 1 to August 31, 1857. Eventually, street-to-street fighting broke out between the British troops and the Indians. Ultimately, the British took control of Delhi. The massacre at Kanpur (July 1857) and the Siege of Lucknow (June to November 1857) were also very important.
Battle of Gwalior.
The last important battle was at Gwalior (now in Madhya Pradesh) in June 1858 in which the Rani of Jhansi was killed. A few days later, the British retook the fortress of Gwalior. The British had now practically suppressed the rebellion, but some guerrilla fighting in many places continued until early 1859. Tantia Tope was captured and executed on April 1859.
British reactions.
The rebellion was an event of great importance in the front of history of modern India. The British Parliament withdrew the right of the British East India Company to rule India in November 1858. The British started ruling India directly through its representative, called the Governor General or the Viceroy, and formally made India part of the British Empire. They promised "the Princes, Chiefs, and People of India," equal treatment under British law. In 1877, Queen Victoria took the title of Empress of India and the Viceroy of India ruled India for her. 
The British sent Bahadur Shah II, the last Mughal Emperor, out of India and kept him in Rangoon (now called Yangon), Burma (now called Myanmar), where he died in 1862. The Mughal dynasty, which had ruled India for about 400 years, ended with his death.
The British also took many steps to employ members of Indian higher castes and rulers in the government and started to employ Indians in the civil services but only at lower levels. They stopped taking the lands of the remaining princes and rulers of India and interfering in religious matters. They increased the number of British soldiers and banned others from handling artillery.
Opinions.
In Britain, newspapers focused on the violence of the mutiny. Charles Dickens wrote that they should take revenge in his 1857 novella "The Perils of Certain English Prisoners".