Appian of Alexandria Civil Wars 2.9.61

[61] As Caesar could obtain no supplies by sea, on account of Pompey’s naval superiority, his army began to suffer from hunger and was compelled to make bread from herbs. ¹ When deserters brought loaves of this kind to Pompey, thinking that he would be gladdened by the spectacle, he was not at all pleased, but said, What kind of wild beasts are we fighting with? Then Caesar, compelled by necessity, drew his whole army together in order to force Pompey to fight even against his will. The latter occupied a number of the redoubts that Caesar had vacated and remained quiet. Caesar was greatly vexed at this and ventured upon an extremely difficult and chimerical task; that is, to carry a line of circumvallation around the whole of Pompey’s positions from sea to sea, thinking that even if he should fail he would acquire great renown from the boldness of the enterprise. ² The circuit was 1200 stades. ³ So, great was the work that Caesar undertook. Pompey built a line of countervallation. Thus they parried each other’s efforts. Nevertheless, they fought one great battle in which Pompey defeated Caesar in the most brilliant manner and pursued his men in headlong flight to his camp and took many of his standards. The eagle (the standard held in highest honor by the Romans) was saved with difficulty, the bearer having just time to throw it over the palisade to those within.