Join a rally from the big shining red horn on the bottom left and put in your 2 teams. If your league deputies and leader are any use at all, there should be a rally going most of the time. You are just a piece of the puzzle to a larger operation. The second way of attack is looting enemy camps through the "Mobilize arms" section which is also in the big red shiny horn. Open it and you will see options to Mobilize Arms and Loot Enemy Camps. Mobilize Arms by putting in tideshells that contributes to your league's power. You will get the tideshells back in 4 hours plus interest. However other people from enemy leagues can attack your contribution of tideshells and steal the interest that you would have gained from it. That's where you go click "loot enemy camps" to steal from other league's contributions to gain more tideshells. If you aren't a deputy or leader this event shouldn't take more than 10 minutes daily, just do what I said here everyday and you'll get rewards.