The core of modern warfare is largely a matter of logistics and support, which includes securing logistical support for one's own military forces and attempting to disrupt the adversary's logistics.
Looking at the data and the economic structures, both Charlemagne and Alfheim cannot withstand the consumption of a prolonged war. Perhaps more prepared, Alfheim might last a bit longer, but any conflict lasting over three years would inevitably cause irreparable damage to its economic system. And Charlemagne… definitely won't last that long.
Having once been in the logistics system and with some connections in the intelligence services, Pasiphael had a relatively clearer understanding of the situation in Charlemagne than the ordinary frontline commander.
