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The original expression is generally attributed to the Roman poet Lucan (d. 65 AD). It occurs for the first time in his work Bellum civile/Pharsalia. Lucan used the term to describe what he believed to be the outstanding characteristic of the Germanic tribe called the Teutones: a mad, merciless, berserk rage in battle.
The Teutons met with the armies of the Roman Republic in the Eastern Alps around 113 BC. The Romans, under the command of the Consul Papirius Carbo, tried to lure the tribe into a trap, but they underestimated their military potential and lost the Battle of Noreia. The Romans also lost the Battle of Arausio (105 BC) and other lesser battles, before putting Gaius Marius in charge of their defence. The Teutons were ultimately defeated in 102 BC.
- Lucanus, Pharsalia 1.255-256: vidimus - - cursumque furoris | Teutonici.