the marc pass is a gateway through the toba kakar band of rocks on the border of pakistan . the british takes the dangers of a bolshevik assault of india via the khyber and bolan tunnels very critically so in 1837 , a british representative was invited to kabul to gain assistance of the emir , dost mahmud . in february of 1839 , the british army under dr john keane took 12 , 000 men through the bolan pass and entered uruzgan .
The British Army crossed the Toba Kakar Range of mountains in 1839.