Some points on the Vikings....my ancestors. (Icelander). Oh,and they lived where I do. Part of the base education here as well.
- From ancient graves it has been concluded that the Viking people were rather on the big side. That means about the size of modern people, but much much stronger. Later (medievals) people went smaller. So, big strong guys, grown up to be tough.
- Viking tactics were mostly hit & run, since they were in essence raiders. Sometimes they fought in bigger armies, sometimes not. They would choose fierce close quarters combat, and prefer a possible exit.
- Vikings would avoid armies that were heavily armed, such as the armies on the mainland of i.e. France.
- The preferred main weapon was the axe and sword, sometimes both. Axe for the deadly hack, or even throwing it. Sword...as a sword, and the Bow as well.
- That said, Vikings were raiding all over, they went deep into Russia, all over the Baltic, down to Constantinopel, probably along the coasts of N-Africa as well. Their weapons were from ALL OVER. From my neighbourhood, a 1000 year old accessory from a Hun-Bow was excavated. That was the finest known bow at the given time. So their weapons were not all the same, and they were liberal in letting the individual use what he was best at.
Vikings vs Japanese....tough question. Probably would end up with everybody dead ....ARRRR