In answer to these objections Leonnatus unfolded to him his secret plans.  His march to relieve Antipater was merely intended as a pretence to cover his real object, which was to attempt to make himself master of Macedonia.  He also showed Eumenes several letters which he had received from Pella, in which Kleopatra offered to marry him if he would march thither.  However Eumenes, either because he feared Antipater, or because he thought Leonnatus to be embarked upon a rash and crazy enterprise, left him by night, taking with him all his property.  He was attended by three hundred horsemen, and two hundred armed slaves, and had with him treasure to the amount of five thousand talents.  He fled at once to Perdikkas, and betrayed all Leonnatus’s plans to him, by which treachery he gained great favour with Perdikkas, and soon afterwards was established in his government of Cappadocia by an army led by Perdikkas himself.  Ariarathes was taken prisoner, the country subdued and Eumenes proclaimed satrap over it.  He distributed the government of the various cities amongst his friends, established garrisons, courts of justice, and receivers of revenue, as an absolute ruler, without any interference from Perdikkas.  But when Perdikkas left the country Eumenes followed him, as he did not wish to be away from the court of that prince.

IV.  However, Perdikkas considered that he was well able to carry out his own designs abroad, but required an active and faithful lieutenant to guard what he already possessed at home.  Consequently when he reached Cilicia he sent Eumenes back, nominally to his own government, but really to observe Armenia where Neoptolemus was endeavouring to raise a revolt.  Eumenes had frequent interviews with this man, who was of a flighty and vainglorious character, and tried to restrain him from any act of open rebellion.  Perceiving also that the Macedonian phalanx was grown very strong, and gave itself most insolent airs, he determined to raise up some counterpoise to it, in the shape of a force of cavalry.

He set free from all taxes and state payments whatever those men of his province who were able to serve as horse soldiers, and bestowed fine horses, purchased by himself, upon their officers and those whom he especially trusted.  He divided them into regiments, frequently bestowed upon them honours and rewards, and constantly exercised them in the performance of military manoeuvres.  Some of the Macedonians were alarmed, but others were delighted to see in how short a time he had raised a force of no less than six thousand three hundred cavalry soldiers.