Zombies will attack the shelters of alliance members in waves, and cease attacks after a member’s shelter is breached twice.

After the first breach your shelter will be on fire. After second breach, you will be out. But you can continue reinforcing others.

After each wave please check your hospital for injured soldiers and heal them.

How long you will be able to stand against waves of zombie attacks is related to your City Gate’s level. For better results please upgrade your city gate whenever you can.

Don’t forget to garrison your strongest troop at the city gate. Please check it before the event starts. With the new update you can arrange 4 formations. But once your city is under attack your 5 heroes in the first formation leads the defense. If no hero is designated for the job or the designated heroes are out for other tasks; the highest level heroes will be chosen automatically to lead the defense.

These 5 heroes in garrison will lead ALL THE TROOPS in the shelter to fight.

What this means is: If you reinforce someone with your formations other than the garrisoned one, Heroes out of your shelter will not make you loose anything in the defense but the troops that they took with them affects the defense.

But when you reinforce someone you get extra points.