If you have the individual's regiment, date of enlistment etc, then you can see his Attestation paper which he would have completed when signing on. The papers are very interesting because they followed the soldier through his service, showing postings, engagements, awards, crimes etc all the way through to discharge. It will also show you his personal details including full physical description, address, next of kin etc etc. Fascinating to read even if you never knew the person. Good luck.