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move your fleet of ships into the seazone, move troops from kent to your fleet (make sure that their weight of your troops is less than the capacity of your ships - you can check weights/capacities by clicking on your respective units), once your troops are aboard, click unload on your fleet and direct your men into calais
 
If you own Calais, you can just send your navy (loaded with troops) to the Calais as well. Saves a bit time.
 
Hmmm... i think you're still able to do that... after all the port is still yours.