Sulla moved to Boeotia to face Archelaus. Their two armies clashed at Battle of Chaeronea in 86 BC, where Archelaus was completely defeated. Archelaus escaped to Chalcis where he received 80,000 reinforcements from Mithridates VI. As Sulla lacked a Roman fleet, Archelaus carried out raids around the Greek coast, even destroying some of Sulla’s transports carrying the advance guard of Sulla’s replacement. Eventually Sulla faced Archelaus at Orchomenus in 86/85 BC. After a two-day battle, Archelaus was decisively defeated by the Romans. After the defeat, he was forced to hide two days in the swamps of Lake Copais, before once again managing to escape to Chalcis.