How do you attack other clans?

There are two ways of issuing a challenge:

• Tap Select Opponent on the Grail home screen. This will open up a list of clans that own a Grail. Clans that can be attacked have an Attack button next to them. 
• Go to the opponent clan’s home screen and tap their Grail. Then follow the instructions on the screen. 

When a clan first issues a challenge, a countdown starts, during which other clans can also sign up to attack the clan. 

When the countdown is over, requests are closed and the system selects the clan that is going to take part in the Grail Battle against the defending clan.

Only Clan Leaders and Deputy Leaders can attack.

Note! Your clan can be attacked while you are attacking.