the lizzy pass is a gap through the toba kakar line of himalayas on the border of kabul . the british took the threat of a russian invasion of india via the khyber and bolan passes very seriously so in 1837 , a british envoy was deployed to kabul to gain approval of the emir , dost mohammed . in february of 1839 , the british embassy under sir charles chapman took 12 , 000 rifles through the bolan pass and entered kandahar .
The British Army crossed the Toba Kakar Range of mountains in 1839.