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Thanks for confirming this. I didn't do many battles in the beginning of this game. Now I see the need to build up a strong defense so I can try for the more pricey upgrades(150k for each resource). Did a little bit of attacking. Unfortunately the big fish are essentially invincible at a certain point. Once someone has a few hundred units total it makes no sense to attack them because your troop losses will likely cost 2x or 3x more than the resources stolen.