If you attack them and are successful, you get the chance to plunder their stuff.

Clicking to attack will open up the battle screen, but unlike working on your continent map or GE you cannot see what they have set for a defending army nor what their defending army’s attacking and defending boost is. The little swords at the bottom are to attack. In the image below (taken from PC) you’ll see that the “Aid” buttons are big and orange, and then to the right of each avatar are three more images (on mobile when you click a person it will have a button clearly marked attack).

So when you’re looking through your neighborhood, you’ll have two options: Aid or Attack.

Plundering is the act of attacking your neighbor, and then stealing their stuff. However, we all hit that stroke of luck in our game at one point or another where we have a relentless attacker and plunderer, and we’re left with few options. If you’re lucky, you sometimes live in the middle of that where you don’t attack your hood often, and it’s rare you get attacked. For others, being the victims of plunder and never the attacker happens more frequently than they’d like. For some, attacking and plundering is second nature. Inno Games built Forge of Empires with plundering as part of the design, and they’ve made no bones about it that it’s here to stay. You can get any of these quests apart from the ones you have already completed during the current era, an era-specific side quest, or a recurring quest.Plundering is a part of the game that isn’t going anywhere. Note: This Quest can show up in different eras, but only once per age: They have to fear you or they will start raiding player's City. We've talked about this before: I am convinced that you need to show a strong hand when dealing with your neighbors.

Forge of empires plunder bot