The main conflict occurred largely in the upper Gangetic plain and central India, with the major hostilities confined to present-day Uttar Pradesh, Bihar, northern Madhya Pradesh, and the Delhi region. The rebellion posed a considerable threat to British East Indian Company power in that region, and it was contained only with the fall of Gwalior on 20 June 1858. Some regard the rebellion as the first of several movements over ninety years to achieve independence, which was finally achieved in 1947.