Kill all the enemies don't let them pass through. Never let even one survive or else you'll fail the mission! It's a plants vs zombies style game...
This, my friend is serious. Our spies have informed us that the enemy carries with them a zombie virus. This virus has decimated their population in Frookland. The same thing good happen to ur bucolic land of Frookenvania. This cannot be. This must not be. This will not be. With u commanding ur kings army, all will be well... right?
Place ur soldiers in the path of the enemy as it comes. Upgrade, get new soldiers and do wot one must do to defend ones land.