Battle of Cannae own "Cannae". Delbrück's seminal study of the battle had a profound influence on German military theorists, in particular the Chief of the German General Staff, Alfred von Schlieffen, whose eponymous "Schlieffen Plan" was inspired by Hannibal's double envelopment maneuver. Schlieffen taught that the "Cannae model" would continue to be applicable in maneuver warfare throughout the 20th century: Schlieffen later developed his own operational doctrine in a series of articles, many of which were translated and published in a work entitled "Cannae". In 1991, general Norman Schwarzkopf Jr., commander of Coalition forces in the Gulf War, cited Hannibal's triumph at Cannae
Early Middle Ages had broken down, and the Roman army comprised mainly barbarians and soldiers recruited for a single campaign. The general decline in discipline also led to the use of smaller shields and lighter weaponry. Not wanting to share the glory, Eastern Emperor Valens ordered an attack on the Therving infantry under Fritigern without waiting for Western Emperor Gratian, who was on the way with reinforcements. While the Romans were fully engaged, the Greuthung cavalry arrived. Only one-third of the Roman army managed to escape. This represented the most shattering defeat that the Romans had suffered since the Battle of Cannae (216