the bolan pass is a crack through the abenaki kakar ranges of mountains on the edge of pakistan . the british took the threat of a russian entry of bengal via the khyber and bolan passes very seriously so in 1837 , a british squadron was ordered to baghdad to gain support of the imam , dost hassan . in october of 1839 , the british army under sir john keane took 12 , 000 men through the marc pass and entered kabul .
The British Army crossed the Toba Kakar Range of mountains in 1839.