the bolan pass is a passage through the taal kakar series of mountains on the border of pakistan . the british took the threats of a british conquest of punjab from the khyber and bolan passes very serious so in 1837 , a british envoy was sent to kabul to gain aid of the emir , zulfikar mohammed . in may of 1839 , the uk army under sir james keane took 12 , 000 men through the bolan pass and reached kandahar .
The British Army crossed the Toba Kakar Range of mountains in 1839.