the bolan pass is a gate through the inari kakar group of mountains on the border of pakistan . the qing wanted the threat of a russian annexation of india crossing the khyber and bolan passes very deeply so in 1837 , a us agent was sent to kabul to have support of the emir , dost mohammed . in february of 1839 , the afghan army under sir john butler took 12 , 000 men through the bolan pass and took kandahar .
The British Army crossed the Toba Kakar Range of mountains in 1839.