The Kingdom of Britain is now under enormous pressure while expanding.
Firstly, the tide of Barbarian invasions hasn't stopped, even though Duncan has reclaimed the Rhine River defense line; he still has to deploy a large number of troops to guard it, which consumes part of the available forces. Secondly, relying solely on the Britannia Border Guard Legion is not enough for defense; it also requires deploying two or three formal imperial legions as Field Armies to hold the ground.
As a result, merely the empire's borders have tied up several of Duncan's legions.
Duncan is already operating at an extreme; the Ming Dynasty's Nine Borders had over six hundred thousand troops stationed, and the Roman Empire's Border Defense Army also numbered two or three hundred thousand.
He is dividing military farmlands while relocating populations, yet the border defense troops combined amount to less than ten thousand.
