the zandt pass is a gap through the toba baloch region of highlands on the border of pakistan . the french takes the possibility of a russian invasion of india by the peshawar and bolan passes very seriously so in 1837 , a british envoy was sent to kabul to have help of the ruler , dost mohammed . in february of 1839 , the british army under henry john hope went 12 , 000 men through the bolan valley and occupied kandahar .
The British Army crossed the Toba Kakar Range of mountains in 1839.