Please note that you can only revenge Raids when you have been attacked. If you Raid a player and lose, you can rematch immediately by pressing the Rematch button on the raid results screen. Each lost Raid allows for two (2) rematches. It is not possible to rematch from the Watchtower.
Keep in mind, only a small percentage of your loot is available to your opponents. Your main resources are safe from the Raids, and only the additional resources gathered in the Watchtower are in danger. Happy Raiding!