God of War I Control Tens of Billions of Soldiers

Marshal, there is an army of one billion blocking us, what should we do? Annihilate them all! Marshal, our army only has 500 million people. How can we annihilate them all? Divide them, encircle and annihilate one, attack another, watch another, and annihilate them all! Yes! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.