Just for information should a similar topic arise again, this is information that I have received from the Royal Artillery Museum regarding the Second Sikh War and the battle at Chillianwallah in 1849:
"The artillery at the Battle of Chillianwallah, the Second Sikh War was
not from Royal Regiment of Artillery, but the Bengal Artillery:
Stubbs, Lt. Col. F. W., History of the Organization, Equipment and War
Services of the Regiment of Bengal Artillery, 3 vols. (London: Henry S.
King & Co., 1877-1895)
2nd Troop 3rd Brigade were present, but were Horse Artillery not field.
Your friend will have no success in identifying his record at Kew nor
will he have a British Army number, he's a European in the colonies
employ. All surviving Indian records are held by:
The British Library
Asia Pacific & Africa Collections
96 Euston Road
London NW1 2DB
Tel: 020 7412 7873
Fax: 020 7412 7641
Email:
oioc-enquiries@bl.uk"