When a player RAIDS your Garrison or land, they will automatically be shielded for a few minutes or until you start attacking other players again (please take note that attacking an opponent automatically disables the shields).Auto shields on all your lands can automatically go up depending on the number of CAPTURES done within a certain number of hours. This also depends on which League you are in. See chart below:
Example: SILVER LEAGUEIf an opponent captures 4 of your lands within 3 hours, the auto-shield on all lands will go up for 6 hours. This will be disabled once the timer runs out or once the player starts to attack other lands again.Please take note that once a player is in the top 4 Leagues (Elite, Champion, Master, and Legend), auto-shields will be disabled and opponents can capture your lands non-stop.
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Dawn of Titans Game GUIDE