The Cambridge History of India, Vol. I: Ancient India v1.c25.23

v1.c25.23

But, if the rāja hesitated, his son Āmbhi (Omphis)¹ had a clear opinion as to what the situation required. He pressed his father to place his principality at the Yavana king’s disposal. While Alexander was still in Bukhāra, Āmbhi began to negotiate on his own account. Envoys from Takshaçilā made their way over the ridges of the Hindu Kush. They were charged with the message that Āmbhi was ready to march by Alexander’s side against any Indians who might refuse to submit. Thus the European, at his first arrival at the Gates of India, found India divided against itself. It was the hand of an Indian prince, which unbarred the door to the invader.