Battle of Pharsalus
In 48 BC, Pompey the Great attempted to use it against Julius Caesar at the Battle of Pharsalus, in what was to be the decisive battle of the Great Roman Civil War. Caesar countered this by ambushing Pompey's "anvil" element; Pompey's infantry was to be the anvil while his cavalry 'hammer' encircled Caesar's left flank. There was significant distance between the two armies, according to Caesar.