The Burning Land, Bernard Cornwell

At the end of the ninth century, King Alfred of Wessex is in ill health; his heir, an untested youth. His enemy, the Danes, having failed to conquer Wessex, now see their chance for victory. Led by the sword of savage warrior Harald Bloodhair, the Viking hordes attack. But Uhtred, Alfred’s reluctant warlord, proves his worth, outwitting Harald and handing the Vikings one of their greatest defeats.