Actually i wouldn't make them double-handed axemen, and also not one-handed axeman (and if though, then mixed with sword-bearers).
Believe me, the viking warrior who was wealthy enough, had an excellent sword as his primary weapon.
Axes were also for the Vikings weapons that carried the most poor men in the field.
It is a myth, that Vikings were axe wielding warriors in the whole. This is only correct for just the warriors who hadn't money or just not the position to afford a fine sword ... often the so-called
Vikingr who either used a one-hand axe (their rusty tool) or surely sometimes also a two-handed axe if they were usually people who had a lot to do with trees/wood
The double-handed battle-axe as the so-called 'dane-axe' came later into use, first in the 11th century, and not uniquely by Vikings.
Nonetheless some rich Vikings had as well fine ornamented expensive created one-handed battle-axes, but rather as 'prunk' weapon, just besides the highly honored and even "holy" sword, which was 100% primarily used in battles. Besides the sword, the spear was wide-spread used as well by Vikings. The axe-myth is caused by the merely poor
Vikingr, who were indeed (partly) the "robbers" ... on "Viking campaign", what originally means something like "being on a raiding campaign" - so evolved the name 'Vikingr'.
Of course those men would make up the bulk of Viking or Danish armies in this time frame, but from up the Karlar unit, they wouldn't have a poor axe. I suggest to give the Karlar a spear or a sword as well, a poorer sword-version.
What i say here isn't a guess, it is historical fact, at least according to my book about the Viking culture.