battleships are at the end of the attacking line

battleships

are at the end of the attacking line, but even though at the end they have i longer range attack and can attack (depending on tech level’s) at other battle phases before the enemy can reach you (think of them a little like archers or snipers in a way) 

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although they don’t give good bonus in attacking they have amazing strength and shield power to help fight off any last enemies they encounter, very costly in resources but in the long run pay off, they also have 1,500 cargo capacity which is decent in a way since its the highest cargo capacity for any troop.

 

cargo ships

(although not added in troop ratio)

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 are at the very very end of your fleet and they are your last resort to attack or defend, although very weak in attack they have descent strength to uphold enemy attacks to help protect your defending troops on bass ( rocket launchers and etc)