I'm not sure the Danes were ever military only, Denmark was also an agricultural society during the viking period. As I understand it, the viking raids were in fact organised around the agricultural calendar, with the two raiding seasons taking place after the harvest and after the sowing. And of course the Vikings were interested in acquiring farming land and often settled and farmed in their places of conquest.
A more apt comparison might be pastoralist raiders as mentioned in Turchin's War and Peace and War, whose nomadic lifestyle led naturally to the development of military skills that could be applied in raids on settled communities. Turchin wrote a lot about the Tatars and the Mongols could also be a good example.