I am not necessarily wondering how accurate these tactics were for vikings themselves but whether any of them have been used at all during the Middle-Ages.

I am going to list down the tactics I can remember:

-Two forces pushing against each other with their shields. One side would, for an instant, lift up an archer so that the archer can shoot straight into the enemy line.

-Again two shield walls pushing against one another but then one side has a row of men take some steps back only to rush into the back of their comrades. This sudden push forward would break the formation of the enemy line.

• Two shield walls again...For an instant, the shield wall would be opened up in a location so that some enemies which stumble forward will be engulfed.