Firepower: How Weapons Shaped Warfare

Ibn Fadlan and the Land of Darkness: Arab Travellers in the Far North

Sweden in the Seventeenth Century

The Saga of the Volsungs: With the Saga of Ragnar Lothbrok

The Drillmaster of Valley Forge: The Baron de Steuben and the Making of the American Army

Njal's Saga

The Whites of Their Eyes: Bunker Hill, the First American Army, and the Emergence of George Washington

Vikings

Ragnar Lothbrok: The Tale of a Viking Warrior King

The Vikings: A Very Short Introduction

Northmen: The Viking Saga, 793–1241 AD

The Ottoman Empire: 1300-1600

The World of Vikings

Sketches in Holland and Scandinavia

The Northmen's Fury: A History of the Viking World

The Age of the Vikings

Folklore Fights the Nazis: Humor in Occupied Norway, 1940–1945

The Real Valkyrie: The Hidden History of Viking Warrior Women