Board Thread:Questions and Answers/@comment-86.21.179.129-20140101103713/@comment-17733617-20140101131725

Players can attack any base within 5 levels of theirs. If their level is too far from yours, then it will say that its level is too low/high for you to attack.

But once you hit level 40 anyone above lvl 40 can attack you.

E.g. A lvl 70 can attack a 40, but not a lvl 39 or below.

Btw, Ship combat does not suffer from this limitation.

I hope this helps. If you have anymore questions, just ask.

/Bullet