Players can Raid each others’ Watchtowers by challenging their teams of Heroes to battles. If you manage to win a Raid, you can win some extra food and iron as well as some shiny Trophies as tokens of your victory.
You can Raid another player by pressing the “Raids” button on the main UI. People can raid you even when your game is closed; you can check who has raided you in the Watchtower. You can also attempt to gain back your lost Food, Iron and Trophies by trying to Revenge the other player. This, too, can be done in the Watchtower.
Remember that in every Raid battle there is also the possibility that you might lose. When you’re defeated, the opposing player will take some of your Food, Iron and Trophies you had stored in the Watchtower. The Watchtower slowly generates more food and iron as time passes on. You can boost your Watchtower’s production rate by claiming Outposts in Story Missions.
The matchmaking system will match you against opponents at a similar trophy level as yours. The power level of the Heroes or Troops of the players is not taken into account.
The difference in the amount of trophies owned by you and your opponent may be considerable at times, but please note that you will earn more trophies when defeating a player who has more trophies than you. Similarly you will lose fewer trophies if you lose against a player who has more trophies than you.