Prime Minister Narendra Modi spent some time on Thursday morning rallying soldiers at Siachen, the world's highest battlefield, where he made a surprise visit as India celebrated the Diwali festival.Modi hailed the role of the armed forces in securing the country.Before reaching here, he went to Siachen early in the morning and spent more than an hour with the soldiers at a base camp situated at a height of over 12,000 feet.He praised their valour and courage, saying that 125 crore Indians could celebrate Diwali today, and go about their lives in comfort, because the jawans stood guard at the borders,prepared to make every sacrifice for the nation.From the icy heights, he also extended Diwali greetings to President Pranab Mukherjee. Modi told the jawans that he had come nannounced, and they may be surprised, but one does not need to announce arrival when coming to one's own family.