At the same time a force of 8,000 Iranians under Vistahm and Vinduyih and 12,000 Armenians under Mushegh II Mamikonian invaded Adurbadagan. Bahram tried to disrupt the force by writing a letter to Mushegh II, the letter said: "As for you Armenians who demonstrate an unseasonable loyalty, did not the house of Sasan destroy your land and sovereignty? Why otherwise did your fathers rebel and extricate themselves from their service, fighting up until today for your country?" Bahram in his letter promised that the Armenians would become partners of the new Iranian empire ruled by a Parthian dynastic family if he accepted his proposal to betray Khosrow II. Mushegh, however, rejected the offer.