The ship would be a smallish one, and I am assuming for the moment that the sailors are in something of a hurry, and therefore may employ both sail and oars at least to get offshort in a hurry. Oh yes, and they are Saxons. :-D
I am assuming that Saxon ships did have sails, because I think the argument they didn't is more than a bit weak, although I'm guessing very likely they would be restricted in their ability to tack or sail close to the wind.
( I have been meaning to carve a Saxon dragon-ship figurehead for approximately 20 years now, and I still have not done it. Maybe one day...)