Appian, The Civil Wars
Horace White, Ed.

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[70] Cæsar's army (for since many writers differ I shall follow the most credible Roman authorities, who give the most careful enumeration of the Italian soldiers, in whom they place most confidence, but do not make much account of the allied forces or record them exactly, regarding them as foreigners and as contributing to them little real assistance) consisted of about 22,000 men and of these about 1000 were cavalry. Pompey had more than double that number, of whom about 7000 were cavalry. Some of the most trustworthy writers say that 70,000 Italian soldiers were engaged in this battle. Others give the smaller number, 60,00000. Still others, grossly exaggerating, say 400,000.¹ Of the whole number some say Pompey's forces were to those of Cæsar as one-and-a-half to one, others say that he had two parts out of three. So much doubt is there as to the exact truth. However that may be, each of them placed his chief reliance on his Italian troops. In the way of allied forces Cæsar had cavalry from both Cisalpine and Transalpine Gaul, besides some light-armed Greeks, consisting of Dolopians, Acarnanians, and Ætolians. Such were Cæsar's allies. Pompey had a great number from all the eastern nations, part horse, part foot. From Greece he had Lacedemonians marshalled by their own kings, and others from Peloponnesus and Bœotians with them. The Athenians marched to his aid also, although proclamation had been made on both sides that no harm should be done to them by the soldiers, since they were the priests of the Thesmophoræ.² Nevertheless, they wished to share in the glory of the war because this was a contest for the Roman leadership.³