How to defend my islands

Hi guys. Can someone explain me how i can protect my islands. The defence which i planned in my island (mount olympus ), does it work on all other islands which i captured? 

i would put a lightning tower on each corner of your round island.

i would also post olympus questions in the olympus forum and not in Rr2,   :stuck_out_tongue:  or are you implying we re gonna get islands in rr2 to ?