Antony's soldiers were casting trenches from the marsh by which they were encamped across the plain, to cut off Cassius's communications with the sea. Caesar was to be at hand with his troops to support them, but he was not able to be present himself, by reason of his sickness; and his soldiers, not much expecting that the enemy would come to a set battle, but only make some excursions with their darts and light arms to disturb the men at work in the trenches, and not taking notice of the troops drawn up against them ready to give battle, were amazed when they heard the confused and great outcry that came from the trenches. In the meanwhile Brutus had sent his tickets, in which was the word of battle, to the officers; and himself riding about to all the troops, encouraged the soldiers; but there were but few of them that understood the word before they engaged; the most of them, not staying to have it delivered to them, with one impulse and cry ran upon the enemy. This disorder caused an unevenness in the line, and the legions got severed and divided one from another;that of Messala first, and afterwards the other adjoining, went beyond the left wing of Caesar and having just touched the extremity, without slaughtering any great number, passing around that wing, fell directly into Caesar's camp. Caesar himself, as his own memoirs tell us, had but just before been conveyed away, Marcus Artorius, one of his friends, having had a dream bidding Caesar be carried out of the camp.
And it was believed that he was slain; for the soldiers had pierced his litter, which was left empty, in many places with their darts and pikes. There was a great slaughter in the camp that was taken; and two thousand Lacedaemonians that were newly come to the assistance of Caesar were all cut off together.
The rest of the army, that had not gone round, but had engaged the front, easily overthrew them, finding them in great disorder, and slew upon the place three legions; and being carried on with the stream of victory, pursuing those that fled, fell into the camp with them, Brutus himself being there. But they that were conquered took the advantage in their extremity of what the conquerors did not consider. For they fell upon that part of the main body which had been left exposed and separated, where the right wing had broke off from them and hurried away in the pursuit; yet they could not break into the midst of their battle, but were received with strong resistance and obstinacy. Yet they put to flight the left wing, where Cassius commanded, being in great disorder, and ignorant of what had passed on the other wing; and pursuing them to their camp, they pillaged and destroyed it, neither of their generals being present; for Antony, they say, to avoid the fury of the first onset, had retired into the marsh that was hard by; and Caesar was nowhere to be found after his being conveyed out of the tents; though some of the soldiers showed Brutus their swords bloody, and declared that they had killed him, describing his person and his age. By this time also the centre of Brutus's battle had driven back their opponents with great slaughter; and Brutus was everywhere plainly conqueror, as on the other side Cassius was conquered. And this one mistake was the ruin of their affairs, that Brutus did not come to the relief of Cassius, thinking, that he, as well as himself, was conqueror; and that Cassius did not expect the relief of Brutus, thinking that he too was overcome. For as a proof that the victory was on Brutus's side, Messala urges his taking three eagles and many ensigns of the enemy without losing any of his own. But now, returning from the pursuit after having plundered Caesar's camp, Brutus wondered that he could not see Cassius's tent standing high, as it was wont, and appearing above the rest, nor other things appearing as they had been; for they had been immediately pulled down and pillaged by the enemy upon their first falling into the camp. But some that had a quicker and longer sight than the rest acquainted Brutus that they saw a great deal of shining armour and silver targets moving to and fro in Cassius's camp, and that they thought, by their number and the fashion of their armour, they could not be those that they left to guard the camp; but yet that there did not appear so great a number of dead bodies thereabouts as it was probable there would have been after the actual defeat of so many legions. This first made Brutus suspect Cassius's misfortune, and, leaving a guard in the enemy's camp, he called back those that were in the pursuit, and rallied them together to lead them to the relief of Cassius, whose fortune had been as follows.
First, he had been angry at the onset that Brutus's soldiers made, without the word of battle or command to charge. Then, after they had overcome, he was as much displeased to see them rush on to the plunder and spoil, and neglect to surround and encompass the rest of the enemy. Besides this, letting himself act by delay and expectation, rather than command, boldly and with a clear purpose, he got hemmed in by the right wing of the enemy, and, his horse ****** with all haste their escape and flying towards the sea, the foot also began to give way, which he perceiving laboured as much as ever he could to hinder their flight and bring them back; and, snatching an ensign out of the hand of one that fled, he stuck it at his feet, though he could hardly keep even his own personal guard together. So that at last he was forced to fly with a few about him to a little hill that overlooked the plain. But he himself, being weak-sighted, discovered nothing, only the destruction of his camp, and that with difficulty.