Twin Peaks is the new 10 player battleground in Cataclysm. The objective is Capture the Flag. The simplest explanation of the battleground is that it's Warsong Gulch with a different layout.
Players tend to gravitate and fight near the central bridge, if you can control it then it accomplishes the same purpose as central map control in Warsong Gulch: it allows you to assist your offense who is trying to return the flag, and cuts off the opposing team's flag carrier from reinforcements.
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