Are we assuming a 6 month journey didnt come with exhaustion and certain death from starvation, pneumonias, dysentery, disease, infections, freezing and trauma from attacks on the way ? In cooler moist climates a mere cut could be life or death back then. There was not any penicillin.
Have you not heard the horror stories even of today’s boat slaves who die packed in?
I think video games filled with light quests of picking moss might be deluding a few people with how the medieval times actually were.
Open a book.