Book excerpt: Not long before the exploits of Eivor Wolf-Kissed, Jarl Stensson and his sons, Ulf and Björn, make their way to England at the behest of Halfdan Ragnarsson and Ivarr the Boneless. Filled with excitement, confidence and bloodlust, the two brothers are eager to go to war against Aelfred the Great and his Anglo Saxon army. But they would do well not to underestimate what awaits them on those green shores...