@Elitestpotato I'm not underestimating the style of warfare at all. I'm just saying is that guerrilla warfare is most effective in scenarios where the guerrillas do not have to hold territory, and they have a large area of low mobility to work within. Your nation is so comparably small that burning your own villages and farms would be inconsequential when faced with most invading forces.
Edit:
That style of combat suits Operian more, because they have a larger and more open territory which does not consist of any rough, mountainous terrain. It's mostly forest and rivers.
Basically, all tactics are effective given the right conditions and I'm not sure that the terrain you chose is right for the tactics you chose.
You said it yourself right here: "they'd Rusia-in-WW2 it." That tactic worked for Russia because Russia is darned big, but the supply lines of a nation like Xiang could reach across your nation and straight through Jura to boot.