To Blumpy:
I don't follow your logic. You say the spies can follow, yes then consume them on the attack to grant the plunder. Right now the spies DON'T because they are not consumed. What about the people that man the tower. They could follow the soldiers just like spies in your scenario. We're not playing star wars at war (where you have auto targeting towers). The towers here need to have people.
All I'm suggestion is you just up the effectiveness of defense buildings you you make this game even mire dependant on already outragously effective potions. We may as just call the game "Kingdoms at Turlte" then. That's what it will be.
10 def pots currently grant 35,300,000 defense. That's more defense then is what is generated by 24 lv3 subs (25,920,000). Now ~10mil more defense from potions then a MAX attack build?
The devs wonder why defense builds have no appeal. Just do the math. It's right in front of your nose!
Again, make the game about strategy (and pros and cons of a build) not who has the most money to buy a billion of every potion.