To go upwind you need a keel (viking ships did) or something that prevents the wind to push the ship away [1]. Sailing against the wind was very important for b

To go upwind you need a keel (viking ships did) or something that prevents the wind to push the ship away [1]. Sailing against the wind was very important for battle ships. What we have now compared to them is better materials and centuries of improved design which turned into tacking closer to the wind and much better maneuverability. We can change direction in a very short space. However our sailing boats are much smaller, closer to the viking ships than to the galleons [2] [1] https://history.stackexchange.com/questions/56264/when-did-humans-develop-the-ability-to-sail-any-direction-regardless-of-wind-dir https://history.stackexchange.com/questions/56264/when-did-h... [2] https://en.wikipedia.org/wiki/Galleon https://en.wikipedia.org/wiki/Galleon