commanded by Norbanus and Saxa, along the Via Egnatia, with the aim of searching for the Liberators' army. Norbanus and Saxa passed the town of Philippi in eastern Macedonia and took a strong defensive position at a narrow mountain pass. Antony was following, while Octavian was delayed at Dyrrachium because of his ill-health (which would accompany him throughout the Philippi campaign). Although Antony and Octavian had been able to cross the sea with their main force, further communications with Italy were made difficult by the arrival of the Republican admiral Gnaeus Domitius Ahenobarbus, with a large fleet of 130 ships. The Liberators did not wish to engage in a decisive battle, but rather to attain a good defensive position and then use their naval superiority to block the triumvirs' communications with their supply base in Italy. They had spent the previous months plundering Greek cities to swell their war-chest. They gathered in Thrace with the Roman legions from the eastern provinces and levies from allies. With their superior forces they were able to outflank Norbanus and Saxa, who had to abandon their defensive position and retreat west of Philippi. This meant that Brutus and Cassius could position their forces to hold the high ground along both sides of the Via Egnatia, about west of the city of Philippi. The southern position was anchored on a supposedly impassable marsh, while on the north on impassable hills. They had time to fortify their position with a rampart and ditch. Brutus positioned his camp to the north while Cassius was on the south of the Via Egnatia. Antony arrived and positioned his army south of the Via Egnatia, while Octavian put his legions north of the road. Forces Antony and Octavian The Triumvirs' army present for the battle included nineteen legions. The sources specify the name of only one legion, IV legion, but other legions present included the III, VI, VII, VIII, X Equestris, XII, XXVI, XXVIII, XXIX, and XXX, since their veterans participated in the land settlements after the battle. Appian reports that the triumvirs' legions were almost at full complement. Furthermore, they had a large allied cavalry force of 13,000 horsemen. The Liberators The Liberators' army had seventeen legions; eight with Brutus and nine with Cassius. Only two of the legions were at full strength, but the army was reinforced by levies from the eastern allied kingdoms. Appian reports that the