A massive army of 10000 men suddenly appeared, intent on conquering Sweden.
My own army itself is only 10000 including mercenaries, but even if I get good defensive ground they get wiped out immediately. My troops are already raised (due to other wars) and their morale is at maximum, but they still get trounced once the battle moves to melee range (I suspect the enemy has more heavy infantry).
Had this been a country, I could split my army and siege several different holdings simultaneously or something, but there seems to be no actual weaknesses in this bomb.
What are the ways I can resist an unbeatable army?