Are you interested in Vikings? They raided and explored from the Middle East to Iceland. 
I dont know much about the,but my family blood line is supposed to have viking in it im told.
They were able to take most everywhere they went except Scotland. The word Viking actually means Pirate in Old English and Seafarer in Old Norse. 
I know one thing they would do is use a shield wall in battle to protect the front.
They actually adopted that from Pre-Early Modern warfare from other nations. 
Interesting! every time i see a viking depicted they have long blonde hair a a helmet with horns lol. 
The helmet with Horns is actual a myth. They didnt ware them. They did have amazing sailing and navigational skills, and characterised by the longship, Viking activities at times also extended all over.
That makes since it seems like something they would do for movies.