BatmanMilitary

A batman is a soldier assigned to a commissioned officer as a personal servant.
Now, you received an order to pass an urgent important message to your masters subordinates.
To buy time, you dare run through the haunted town in order to complete the mission.

Batmans duty:
Acting as a "runner" to convey orders from the officer to subordinates
Maintaining the officers uniform and personal equipment as a valet
Driving the officers vehicle, sometimes under combat conditions
Acting as the officers bodyguard in combat
Other miscellaneous tasks the officer does not have time or inclination to do
The action of serving as a batman was referred to as "batting". In armies where officers typically came from the upper class, it was not unusual for a former batman to follow the officer into later civilian life as a domestic servant.