This past millennium has been characterized by incessant conflicts across the face of the globe, and here Anthony Tucker-Jones selects 20 key battles that illustrate the changing face of warfare. Bosworth Field, Tenochtitlan, the 1940 Blitz, and D-Day are covered here, but many of these other turning points will be less familiar: England's 1066 skirmish with the Vikings that later swayed the results at the Battle of Hastings; the 1815 French-Prussian battle at Wavre, the fight that actually sank Napoleon's comeback bid; and the 1918 tank versus tank clashes at Villers-Bretonneux, opening a new era of mechanized warfare.