We already risk going into a suicide pact if they capture our people. Sacred War makes it worse
Weapons are expensive to make and maintain when they are made from bone and wood.
We're not in the iron age dude.Doesn't mean we cant use levied people to fill the gaps and fight a guerrilla war. I think in later ages it will be similar to spartans and perioikoi hoplites. The spartans of our society trained for war and holy service, and the perioikoi of our society being the rest. phalanxes can turn ordinary people into tanks. We could also have a law after this war stating that every household must have a spear, shield, bow and sling within it.
Weapons are expensive to make and maintain when they are made from bone and wood.