I didn't say they didn't achieve anything they were certainly good sailors and I didn't say there wasn't a warm period that made it easier for them, but when they told of their deeds over centuries some things got a little exaggerated such as the Norse Sagas suggest they won the battle of Clontaff in 1014. They were primarily raiders and so didn't set up permanent settlements in the americas or perhaps they found the environment as harsh as the europeans who settled Jamestown