POP A PLAYER'S PROTECTIVE BUBBLE

Beginner's Protection and Dove of Peace protect players from attack. After this protection expires, the "bubble" over their city/cities will remain in place until they send out an attack or until another player pops the bubble. If you click on the city from the map, you will still get a message stating the player is under protection or truce. However, a simple trick allows you to bypass this protection and pop the bubble.

TRICK:  To pop the bubble, simply attack from your Rally Point instead of clicking on their city.