* Divisional Structure: The IJA typically integrated cavalry units within divisions, not as a separate group. These were often called "Cavalry Regiments" or "Cavalry Squadrons" and were assigned to infantry divisions.
* Specialized Roles: The IJA used cavalry for reconnaissance, raids, and even as mobile artillery units. Their tactics emphasized speed and maneuverability, not large-scale mounted charges.
* Mechanization: As the war progressed, the IJA began replacing horses with motor vehicles, leading to the formation of "Motorized Cavalry" units. These were more akin to mechanized infantry than traditional cavalry.
Therefore, there is no specific date for the creation of an "IJA Cavalry Group" because it never existed as a separate entity.
If you are looking for information about a specific cavalry unit, please provide more details. I can then help you find information about its creation date and history.