Dr P Shashirekha , Sahitinandanam , Bhagavadgita , Ch 1, sl 10 - 25

BHagavadgita 1st chapter is special because , it explains the arrangement of Army troops ,The musical instruments played to indicate the beginning of the war, gettings troops ready by forming in to various Battle - Arrays etc. All this focus on the Knowledge of Military science in Ancient India at the time of Mahabharata War itself .