On his landing in Syria, Caesar found letters pressing for his instant return to Rome. Important persons were waiting to give him fuller information than could be safely committed to writing. He would have hastened home at once, but restless spirits had been let loose everywhere by the conflict of the Roman leaders. Disorder had broken out near at hand. The still recent defeat of Crassus had stirred the ambition of the Asiatic princes; and to leave the Eastern frontier disturbed was to risk a greater danger to the Empire than was to be feared from the impatient politics of the Roman mob, or the dying convulsions of the aristocracy. Pharnaces, a legitimate son of Mithridates the Great, had been left sovereign of Upper Armenia. He had watched the collision between Pompey and Caesar with a neutrality which was to plead for him with the conqueror, and he had intended to make his own advantage out of the quarrels between his father's enemies. Deiotarus, tributary king of Lower Armenia and Colchis, had given some help to Pompey, and had sent him men and money; and on Pompey's defeat, Pharnaces had supposed that he might seize on Deiotarus's territories without fear of Caesar's resentment. Deiotarus had applied to Domitius Calvinus for assistance; which Calvinus, weakened as he was by the despatch of two of his legions to Egypt, had been imperfectly able to give. Pharnaces had advanced into Cappadocia. When Calvinus ordered him to retire, he had replied by sending presents, which had hitherto proved so effective with Roman proconsuls, and by an equivocating profession of readiness to abide by Caesar's decision. Pharnaces came of a dangerous race. Caesar's lieutenant was afraid that, if he hesitated, the son of Mithridates might become as troublesome as his father had been. He refused the presents. Disregarding his weakness, he sent a peremptory command to Pharnaces to fall back within his own frontiers, and advanced to compel him if he refused. In times of excitement the minds of men are electric, and news travels with telegraphic rapidity if not with telegraphic accuracy. Pharnaces heard that Caesar was shut up in Alexandria and was in a position of extreme danger, that he had sent for all his Asiatic legions, and that Calvinus had himself been summoned to his assistance. Thus he thought that he might safely postpone compliance till the Roman army was gone, and he had the country to himself. The reports from Egypt were so unfavorable that, although as yet he had received no positive orders, Calvinus was in daily expectation that he would be obliged to go. It would be unsafe, he thought, to leave an insolent barbarian unchastised. He had learnt in Caesar's school to strike quickly. He had not learnt the comparison between means and ends, without which celerity is imprudence. He had but one legion left; but he had a respectable number of Asiatic auxiliaries, and with them he ventured to attack Pharnaces in an intricate position.