 The <unk> army pressed on after the monsoon season . In the following dry season of <unk> – 78 , c . December <unk> , a <unk> army of <unk> led by <unk> al @-@ Din , son of <unk> <unk> <unk> , advanced to <unk> , which defended the <unk> Pass . They occupied the fort and destroyed a large number of abandoned <unk> . But they found the heat excessive and returned . 
