Cogs and other 12th century sailing vessels
How many crew members would it have taken to man a 12th. century cog?
How would such a ship navigate in and out of dock? Would oars be used? Is it possible that smaller oared boats were ever used as tugs?
Were there other styles of ship in use at the time in Europe, capable of transporting, say, men and horses?
Questions, whose answers are presumably highly speculative, from someone who knows very little about sailing, I'm afraid!