And to answer one of your earlier questions, I think it most unlikely that he married without his Commanding Officer's permission, especially if this occurred after he was commissioned. As someone commissioned from the ranks he would have been very conscious of the need to follow etiquette, especially if he didn't come from the same social background as his fellow officers. Are you sure he was commissioned into the 51st? It was not uncommon for men like him to accept a commission in a different regiment to avoid the issue of how to deal with soldiers who were formerly his associates. Very often men commissioned after a long service as a soldier (15 years in his case) would be employed as a quartermaster, or a paymaster, if sufficiently numerate.