Nader used the pretext of his Afghan enemies taking refuge in India to cross the border and invade the militarily weak but still extremely wealthy far eastern empire. In a brilliant campaign against the governor of Peshawar, he took a small contingent of his forces on a daunting flank march through nearly impassable mountain passes, and took the enemy forces positioned at the mouth of the Khyber Pass completely by surprise, decisively beating them despite being outnumbered two-to-one. This led to the capture of Ghazni, Kabul, Peshawar, Sindh and Lahore.