Diocletian's Defense in Depth Strategy

Diocletian's strategy was to build strong defensive walls around every city, town and granary in sight. These fortified positions became key hinge points for the new defensive strategy. A large invasion force would then be able to easily blow past the limitani but that was ok, because they could take refuge in their well supplied, easily defended forts. Then, of course, if you're wondering what the effect this vast increase the size of the military had on the overall economy, as the romans were essentially transferring a hundred and 50 thousand young men from productive farm labor to non productive soldiering. Well the answer is that the economy took a pretty substantial hit, a hit will get into