For the ancients thought that nothing was more desirable than glory which was gained, not by brilliancy of wealth, but by address in arms.
Accordingly, the most famous men of old were so minded as to love seditions, to renew quarrels, to loathe ease, to prefer fighting to peace, to be rated by their valour and not by their wealth, to find their greatest delight in battles, and their least in banquetings.
But Halfdan was not long to seek for a rival.

A certain Siwald, of most illustrious birth, related with lamentation in the assembly of the Swedes the death of Frode and his queen; and inspired in almost all of them such a hatred of Halfdan, that the vote of the majority granted him permission to revolt.

Nor was he content with the mere goodwill of their voices, but so won the heart of the commons by his crafty canvassing that he induced almost all of them to set with their hands the royal emblem on his head.

Siwald had seven sons, who were such clever sorcerers that often, inspired with the force of sudden frenzy, they would roar savagely, bite their shields, swallow hot coals, and go through any fire that could be piled up; and their frantic passion could only be checked by the rigour of chains, or propitiated by slaughter of men.

With such a frenzy did their own sanguinary temper, or else the fury of demons, inspire them.
When Halfdan had heard of these things while busy roving, he said it was right that his soldiers, who had hitherto spent their rage upon foreigners, should now smite with the steel the flesh of their own countrymen, and that they who had been used to labour to extend their realm should now avenge its wrongful seizure.