the doda range is a break through the toba kakar massif of mountains on the border of pakistan . the sikhs took the threat of a russian invasions of india via the khyber and bolan passes very seriously so in 1837 , a british envoy was flown to lahore to gain support of the amir , dost mohammed . in may of 1839 , the british army under sir john butler took 12 , 000 men through the mack mountains and entered kandahar .
The British Army crossed the Toba Kakar Range of mountains in 1839.