The introduction of the Enfield Rifles with greased cartridges was the primary cause of dissatisfaction among Indian soldiers, igniting the Revolt of 1857. These cartridges were purportedly greased with cow and pig fat, offending both Hindu (for whom cows are sacred) and Muslim (who deem pigs unclean) soldiers. This generated extensive animosity and was instrumental in initiating the revolt.
While the Doctrine of Lapse and the Subsidiary Alliance fostered British control in India, they were not direct catalysts for the soldierly discontent that precipitated the 1857 rebellion.