In 1851, he obtained a post as assistant surgeon to the Honourable East India Company and served with the 4th Sikh Infantry in the Second Anglo-Burmese War 1852/53 winning a campaign medal and clasp.
[3] He served with the 1st Cavalry 1855 to 1857 and accompanied Meade's Horse regiment at the Mutinies of Gwalior and Agra in 1858, again receiving a campaign medal and clasp.
Late in 1858 he was made superintendent of vaccination and lecturer in surgery at Agra Medical School.
First to Jemima Anne (Annie) Cowley Brown (possibly a cousin) who died in 1876, then to Florence Elworthy (1851-1949) who was considerably his junior.
[10] His youngest son, Lieutenant Frederick John Christison (b.1895) was killed on 4 December 1915 in the First World War while serving with the 10th battalion Argyll and Sutherland Highlanders.
[11] He was succeeded in the baronetcy by his oldest son Major Robert Alexander Christison of the Royal Garrison Artillery.