The Siege of Delhi was one of the decisive conflicts of the Indian rebellion of 1857 when Indian soldiers of the British East India Company's Bengal Army, openly rebelled against their British officers and unexpectedly, crossed the bridge of boats over the Jumna River to Delhi. The rebellion was due to the introduction of the Pattern 1853 Enfield rifle. The cartridges for this were widely believed to be greased with a mixture of cow and pig fat, and to bite them open when loading the rifle (as required by the drill books) would defile both Hindu and Muslim soldiers.

 The Siege of Delhi was one of the decisive conflicts of the Indian rebellion of 1857 when Indian soldiers of the British East India Company's Bengal Army, openly rebelled against their British officers and unexpectedly, crossed the bridge of boats over the Jumna River to Delhi. The rebellion was due to the introduction of the Pattern 1853 Enfield rifle. The cartridges for this were widely believed to be greased with a mixture of cow and pig fat, and to bite them open when loading the rifle (as required by the drill books) would defile both Hindu and Muslim soldiers.