The First War of Independence of 1857 was a period of uprising in northern and central India against British rule in 1857–58. The rebellion was the result of decades of ethnic and cultural differences between Indian soldiers and their British officers. The indifference of the British towards Indian rulers like the Mughals and ex-Peshwas and the annexation of Oudh were political factors triggering dissent amongst Indians. Dalhousie’s policy of annexation, the doctrine of lapse or escheat, and the projected removal of the descendants of the Great Mughal from their ancestral palace to the Qutb, near Delhi also angered some people. The specific reason that triggered the rebellion was the rumoured use of cow and pig fat in .557 calibre Pattern 1853 Enfield (P/53) rifle cartridges. Soldiers had to break the cartridges with their teeth before loading them into their rifles. So if there was cow and pig fat, it would be offensive to Hindu and Muslim soldiers, respectively. In February 1857, sepoys (Indian soldiers in the British army) refused to use their new cartridges. The British claimed to have replaced the cartridges with new ones and tried to make sepoys make their own grease from beeswax and vegetable oils, but the rumour persisted.