 Complete the following phrase:  The Sikh Light Infantrys predecessors, the 23rd, 32nd and 34th Royal Sikh Pioneers of the British Indian Army, could all trace their origins to 1857. The 23rd Sikh Pioneers were raised as 15th Pioneer Regiment of Punjab Infantry and although they were pioneers by name, they functioned as a regular infantry regiment specially trained as assault pioneers. They served during the Second Opium War, the 