I apologize in advance but this question comes from a TV show I watch and game I play. Before you tell me those are wrong, I know, but I've done some of my own research and cant seem to find an answer. In the show Vikings they plan on sailing east to Russia to raid but later to England. They make a big deal about going west not east. In the show I have never heard them talk about raiding south though (I am not talking about Francia either). Then my game knowledge gets me asking questions. I am very into a game called Crusader Kings 2. From that I know that Lithuania is occupied by Romuvans and the Holy Roman Empire forms in the 900's. Did the vikings ever raid in those places? I don't want answers relating to the show or game, these where just inspiration for the question.
Bonus question: In the show the vikings always seem to win and its a bit annoying, but in the game kings and emperors are able to raise hundreds and thousands of troops. Was there a battle where Vikings didn't know what they where getting into and where crushed by an army of hundreds of men?
For the bonus question, the Battle of Stamford Bridge ended badly for the Viking King Harald Hardrada, who led an army of Northmen to England to force his claim to the throne of England. He was according to legends shot dead with an arrow to the throat, and his army was shattered. Leaving the throne of England to in the end, William the Conquer.
Even then, vikings were indeed able to mount effective raids, precisely because they are usually fast enough to hit their targets without incurring significant responses in time. Once Alfred the Great set up a chain of fortresses to enable faster response, the viking raids to England gradually decreased.