 In 1826, this battalion was elevated into a separate regiment called 'The 25th Regiment of Bombay Native Infantry'.After serving in Afghanistan and in the North-West Frontier Province, the regiment joined the Sindh Expedition, coming under the command of General Sir Charles James Napier, who conquered Sindh in 1843 and sent back to the Governor General the one-word message ""Peccavi"" – Latin for ""I have sinned"".At the Battle of Meeanee, a bond was cemented between Napier and the regiment, which sixty years later was given his name.