(a) In the Barrackpore cantonment, Mangal Pande shot at the British officer.

Mangal Pande shot at the British officer because he was forcing the use of cartridges that were believed to have a greased covering of cow or pig fat.

(b) Between 1848 to 1856, Lord Dalhousie annexed more states.

Lord Dalhousie abolished many states during this period including Jhansi, Satara, Nagpur and others by rejecting the rights of inheritance of their adopted sons. He dethroned the Nawab of Avadh on pretext of mismanagement. Further, he stopped making the annual payments to the successors of some deposed kings.

(c) Bahadur Shah Jafar was proclaimed the Emperor of India.

The first series of attacks that took place in Barrackpore were followed by the hanging of Mangal Pande. As this news spread like wild fire, battalions of Indian soldiers from Merath marched towards Delhi along with thousands of common people. On reaching Delhi, they gave the leadership of the revolt to Bahadur Shah Jafar, proclaiming him as the Emperor of India.