Ressaidar was a Viceroy's commissioned officer's (VCO) rank in the British Indian Army.
Ressaidar denoted a junior commander of a risala or risalah (a body of horse,[1] regardless if troop or regiment[2]) in Persian.
This native Officer's rank existed in Cavalry only, there was never a corresponding position in the other arms.
A Ressaidar was roughly equivalent to a 'Captain, 2nd Class' or 'Captain lieutenant', but in World War I, he was classified as native 'Lieutenant'.
[6] Nevertheless, all VCO's were always outranked by the lowest british Officer with a full commission.