The Battle of Orchomenus was fought in 85 BC between Rome
and the forces of Mithridates VI of Pontus. The Roman army was led by
Lucius Cornelius Sulla, while Mithridates' army was led by Archelaus. The Roman force was victorious, and Archelaus later defected to Rome.
Archelaus, who had received reinforcements from Mithridates and from his Greek allies, again
outnumbered Sulla by about the same margin as at Chaeronea. Sulla, contemptuous of his
adversaries, but exercizing judicious care in his plans and preparations, again used field fortifications to assist him in
advancing against the sluggish foes, defeating by a decisive envelopment. Sulla now prepared to invade Asia.
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