In 1862, Collingridge and C. T. Metcalfe, a Joint Magistrate, submitted an application for the raising of a Mounted Volunteer Corps to the Commissioner of the Behar division. Sanction was obtained and on 8 December 1862, the Soubah Behar Mounted Rifles Volunteer Corps was formed.
In 1862, Collingridge and C. T. Metcalfe, a Joint Magistrate, applied to establish a Mounted Volunteer Corps in the Behar division. Permission was given, and on December 8 of that year, the Soubah Behar Mounted Rifles Volunteer Corps came into existence.