A lesson of the long deceased N Curzon, long "succesful" British administrator of the North West Frontier province from 1898 to somewhere between 1902 and 1905.
The raiders, Bugti from Afghanistan, travelled to their targets.
In this case, the directions were fairly constant, over a particular border.
Curzon removed garrisons, likely targets, and made patrols in the direction of the border, cross-cutting the expected paths of the raiders.
I have no real way of knowing whether there are regular "raiding" routes in use, but some arrows exist on a map the DoD has made public.