the bolan pass is a tunnel through the inari kakar range of mountains on the frontiers of pakistan . the french wanted the threat of a russian invasions of punjab from the punjab and bolan regions very seriously so in 1837 , a government envoy was sent to peshawar to find support of the emir , dost mohammed . in february of 1839 , the royal army under sir john butler took 12 , 000 women through the bolan pass and entered paktia .
The British Army crossed the Toba Kakar Range of mountains in 1839.