Anno1404 2nd mission in campaign: How to deliver fish and cider

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In Anno 1404, in the second mission of the campaign, you are asked to deliver 15t fish and 3t to Guy Forcas, but after loading these supplies on my ship and reaching the port of Forcas(Twickham) , I find that I cannot unload these from my ship, even though I am in range, as it keeps saying 'no suitable territory found'. How do I deliver the supplies to Forcas?
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Anno 1404 Beginners Guide Walkthrough Gameplay Example Part 1
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