The word Dinapur means the "City of Grains", being located in the fertile Gangetic plains.

Danapur happened to be the second important center in the country, which influenced Eastern Uttar Pradesh, Bengal and Orissa.

Mutinying sepoys from 7th, 8th, and 40th Regiments of Bengal Native Infantry quickly moved towards the city of Arrah and were joined by Babu Kunwar Singh and his men.

The Siege of Arrah was eventually crushed on 3 August 1857 by Major Vincent Eyre (The 5th Fusiliers) and his men.

This garrison was to provide transit facilities to the British Expeditionary Force from Calcutta towards the northern provinces of India.

Today, the Arrah Barracks, St Luke's Church, Havlock Church, the Flag Staff House, Military Hospital, Supply Depot and The Bihar Regimental Centre etc.

A Category II cantonment, Danapur Cantt is spread across an area of approximately 848.50 acres.