My provinces keep getting the waterloo treatment

[Tuna-Fish]

One thing the learn about dominions is that there is absolutely nothing that is good against everything. Scout a lot, and when you see a large enemy army closing attack it with one chep commander or something, and look closely what kind of troops he has.

Giants? They kill everything they hit in one turn, so either get them more targets (smaller, cheaper units) or targets that are harder to hit. (more def, etherealness, luck, whatever)

Do they have low prot? (archers shine against low protection non-shielded units.)

Small armoured units? (trample, giantgs)

Undead horde? (I banish thee...)

And so on and so on...