As Mount Serrium projected into the sea Cassius and Brutus turned to the mainland, but they sent Tillius Cimber with the fleet and one legion of troops and some archers to sail around the promontory, which, although fertile, was formerly deserted because the Thracians were not accustomed to the sea and avoided the coast for fear of pirates. So the Chalcideans and other Greeks took possession of it, being seafaring people, and caused it to flourish with commerce and agriculture, and the Thracians were much gratified by the opportunity for the exchange of products. Finally Philip, the son of Amyntas, drove out the Chalcideans and other Greeks so that no traces of them were to be seen except the ruins of their temples. Tillius sailed along this promontory, again deserted, as he had been ordered to do by Cassius and Brutus, measuring and mapping places suitable for camps, and approaching it with his ships now and then in order that the forces of Norbanus might abandon the pass, under the belief that it was useless to hold it longer. And it turned out as he had anticipated, for on the appearance of the ships Norbanus became alarmed for the Sapæan pass and called on Decidius to hasten from that of the Corpileans to his assistance, which he did. As soon as the latter pass was abandoned Brutus and Cassius marched through it.

When the stratagem became manifest Norbanus and Decidius occupied the gorge of the Sapæans strongly. Again Brutus and Cassius could find no passage. They fell into discouragement lest they should now have to begin the roundabout journey which they had disdained, and to turn upon their own tracks, although pressed by time and the lateness of the season. While they were in this mood Rhascupolis said that there was a circuitous route (along the very side of the Sapæan mountain) of three days' march, which had been impassable to men up to this time on account of rocks, scarcity of water, and dense forests. If they would carry their water and make a narrow but sufficient pathway, they would be so enveloped in shade that they would not be perceived even by birds. On the fourth day they would come to the river Harpessus, which falls into the Hebrus, and in one day more they would be at Philippi, flanking the enemy so as to cut him off completely and leave him no chance to retreat. They adopted this plan since there was nothing else to do, and especially because it held out the hope of surrounding so large a force of the enemy.

They sent a detachment in advance under command of Lucius Bibulus, in company with Rhascupolis, to cut a path. They found it a very laborious task, but they accomplished it nevertheless with enthusiastic zeal, and all the more when some who had gone ahead came back and said that they had had a distant view of the river. On the fourth day, fatigued with labor and thirst, the water which they carried being nearly exhausted, they recollected that it had been said that they should be in a waterless region only three days. So they fell into a panic, fearing that they were the victims of a stratagem. They did not disbelieve those who had been sent in advance and who said that they had seen the river, but they thought that they themselves had been led in a different direction. They lost heart and cried aloud, and when they saw Rhascupolis riding by and exhorting them to have courage, they reviled him and threw stones at him. While Bibulus was beseeching them with words of good cheer to persevere to the end, towards evening the river was seen by those in front, who, as was natural, raised a cry of joy, which was taken up by those behind in due order until it reached the rear. When Brutus and Cassius learned this they hurried forward at once, leading on the remainder of their army through the pathway that had been cleared. Nevertheless, they did not conceal their doings from the enemy altogether, nor surround them, for Rhascus, the brother of Rhascupolis, having his suspicions aroused by the shouting, made a reconnoissance; and when he saw what was being done he was astonished at so large an army traversing a pathway where no water could be obtained, and where he thought not even a wild beast could penetrate by reason of the dense foliage, and he forthwith communicated the news to the army of Norbanus. The latter retreated by night from the gorge of the Sapæans toward Amphipolis. Each of the Thracian brothers received an ovation in his own army, the one because he had led an army by an unknown path, the other because he had discovered the movement.

Thus Brutus and Cassius by an astounding act of audacity advanced to Philippi, where Tillius also disembarked, and the whole army was there assembled. Philippi is a city that was formerly called Datus, and before that Crenides, because there are many springskrhni/s: "a small spring." bubbling around a hill there. Philip fortified it because he considered it an excellent stronghold against the Thracians, and named it from himself, Philippi. It is situated on a precipitous hill and its size is exactly that of the summit of the hill. There are woods on the north through which Rhascupolis led the army of Brutus and Cassius. On the south is a marsh extending to the sea. On the east are the gorges of the Sapæans and Corpileans, and on the west a very fertile and beautiful plain extending to the towns of Murcinus and Drabiscus and the river Strymon, about 350 stades. Here it is said that Cora was carried off while gathering flowers, and here is the river Zygactes, in crossing which they say that the yoke of the god's chariot was broken, from which circumstance the river received its name.This is the mythological tale of the seizure of Proserpine by Pluto. The Greek name of Proserpine was Persephone, but she was worshipped at Athens under the name of Cora (the maiden), in conjunction with her mother, Demeter. The place of her seizure was commonly assigned to the plain of Enna in Sicily. The word Zygactes in Greek means "broken yoke." This river is not mentioned by any other author. The plain slopes downward so that movement is easy to those descending from Philippi, but toilsome to those going up from Amphipolis.

There is another hill not far from Philippi which is called the Hill of Dionysus, in which are gold mines called the Asyla. Ten stades farther are two other hills, at a distance of eighteen stades from Philippi itself and eight stades from each other. On these hills Cassius and Brutus were encamped, the former on the southern and the latter on the northern of the two. They did not advance against the retreating army of Norbanus because they learned that Antony was approaching, Octavius having been left behind at Epidamnus on account of sickness. The plain was admirably situated for fighting and the precipitous hill-tops for camping, since on one side of them were marshes and ponds stretching as far as the river Strymon, and on the other gorges destitute of roads and impassable. Between these hills, eight stades apart, lay the main pass from Europe to Asia as between gates. Across this space they built a fortification from camp to camp, leaving a gate in the middle, so that the two camps became virtually one. Alongside this fortification flowed a river, which is called by some the Ganga and by others the Gangites,This is the river Angites mentioned in Herodotus vii. 113, where Xerxes paused and offered a sacrifice of white horses to the river Strymon. Its present name is the Anghista. and behind it was the sea, where they could keep their supplies and shipping in safety. Their depot was on the island of Thasos, 100 stades distant. Their triremes were anchored at Neapolis, at a distance of seventy stades. Brutus and Cassius were satisfied with the position and they proceeded to fortify their camps.