this is my issue with this series.
all the tactics when they can just throw in the nuke and be done with it.
even if their tactics fails they can just throw in their nuke like Ike or the demon king to make tactics not even matter, even their top mage can beat the hero's party alone so like...
he is not doing the right thing per say
he is simply betting on the winning lot
like why continue to be with the dude who will be replaced later on go with the owner's daughter with the support of practically everyone instead and one of them is this genius dude.
why waste time putting sand in a bag just use wood that's slightly angled it worked for the japanese against musket fire
plus you can move it if you march forward
he is the counter measure
he can just magic it out like usual. in majority of his battles he was the deciding factor guns just ensure less of his men die