What did alexander the great do when he reached the swat valley?

Alexander led his army to conquer the swat valley and the Swati villagers fled to the mountains asking for a divine protection and they believe that their Gods will protect them because the mountain is so high. In order to conquer and to prove his power Alexander build a wooden ramp to place his catapults and arrow units and also he climbed up so he could hold the star of Jupiter representing his power and greatness.