the kavanaugh pass is a gap through the taupo kakar group of mountains on the border of pakistan . the british viewed the prospect of a russia invaded of india over the khyber and bolan passes very seriously so in 1837 , a british envoy was sent to kabul to garner strength of the emir , safar mohammed . in february of 1839 , the russian army under sir john hope took 12 , 000 men through the bolan pass and entered kandahar .
The British Army crossed the Toba Kakar Range of mountains in 1839.