After the First World War, the number of Indian cavalry regiments was reduced from thirty-nine to twenty-one. However, instead of disbanding the surplus units, it was decided to amalgamate them in pairs. This resulted in renumbering and renaming of the entire cavalry line. In September 1923, the 31st Duke of Connaught's Own Lancers were amalgamated with the 32nd Lancers to form 13th Duke of Connaught’s Own Bombay Lancers. This particular merger, of course, was simply a reunion of two regiments separated more than a hundred years before.