When can I attack other Bases?:SI
You may begin attacking other Bases as soon as you have Offensive Units.
However, you may want to wait until you are more experienced in basic game-play and then take note of the following information:
Users registered for less than 3 days fall under the classification of Low-Level Player Protection. They can attack any player but no one can attack their Base.
Any new player that attacks a player who has been in-game for over 3 days will LOSE THEIR PROTECTED STATUS!
If two users initiate a conflict with each other whilst both have been playing the game for less than 3 days, the conflict will continue regardless of the users' future relative levels or time in-game.