A ratty piece of parchment with large writing on one side.
"Hold the Sokal Keep on Thorn Island at all costs. If attacked, sacrifice your troops as necessary to hold out until relieved.
"In your deployment set two squads of hobgoblins to patrol Thorn Island at all times. At least 2 squads of archers are to be deployed on the walls at all times. Let the pack of wardogs loose to cover the island several times a day at random intervals. Set pairs of kobolds as observers in hidden locations around the island.If Thorn Island is invaded immediately dispatch a message back to the castle. We will send over however many reinforcements are necessary to hold the island."