Pirate ships over and over again will attack your castle by shooting it out of their guns. You have to give them a fight, defending using available at your disposal means of combat which can be pumped to the extent of making money. Shoot the queue with the pirates, trying to each your kernel reached the goal.
Having seized a great island, the old pirate has finally retired. But old enemies found him hiding place and decided to rob the old man. How good that the island still has the old fleet. The huge stone wall with the gun is capable to drive the enemy away. Take a shot and wait for the response kernel running from pirates.