The two Roman armies encamped over against each other at Melitaea on the northern slope of Mount Othrys; a collision seemed inevitable.

But Flaccus, after he had opportunity of convincing himself that Sulla's soldiers were by no means inclined to betray their victorious leader to the totally unknown democratic commander-in chief, but that on the contrary his own advanced guard began to desert to Sulla's camp, evaded a conflict to which he was in no respect equal, and set out towards the north, with the view of getting through Macedonia and Thrace to Asia and there paving the way for further results by subduing Mithradates.
That Sulla should have allowed his weaker opponent to depart without hindrance, and instead of following him should have returned to Athens, where he seems to have passed the winter of 668-9, is in a military point of view surprising.

We may suppose perhaps that in this also he was guided by political motives, and that he was sufficiently moderate and patriotic in his views willingly to forgo a victory over his countrymen, at least so long as they had still the Asiatics to deal with, and to find the most tolerable solution of the unhappy dilemma in allowing the armies of the revolution in Asia and of the oligarchy in Europe to fight against the common foe.
Second Pontic Army Sent to Greece Battle of Orchomenus In the spring of 669 there was again fresh work in Europe.
Mithradates, who continued his preparations indefatigably in Asia Minor, had sent an army not much less than that which had been extirpated at Chaeronea, under Dorylaus to Euboea; thence it had, after a junction with the remains of the army of Archelaus, passed over the Euripus to Boeotia.

The Pontic king, who judged of what his army could do by the standard of victories over the Bithynian and Cappadocian militia, did not understand the unfavourable turn which things had taken in Europe; the circles of the courtiers were already whispering as to the treason of Archelaus; peremptory orders were issued to fight a second battle at once with the new army, and not to fail on this occasion to annihilate the Romans.

The master's will was carried out, if not in conquering, at least in fighting.
The Romans and Asiatics met once more in the plain of the Cephissus, near Orchomenus.