the stefani pass is a gap through the tiberias kakar massif of highlands on the border of pakistan . the british took the threat of a russian invasion of iran via the khyber and bolan passes very seriously so in 1837 , a british mission was sent to kabul to gain support of the emir , dost mohammed . in november of 1839 , the uk troops under sir george keane took 12 , 000 men through the bolan pass and in kandahar .
The British Army crossed the Toba Kakar Range of mountains in 1839.