India as a nation went through a very traumatic experience in 1962. Our faith in the impregnability of the Himalayas, the infallibility of our foreign policy and the invincibility of our Army, got shattered. I was then an Instructor at Staff College. I was assigned the task of preparing a Telephone Battle exercise for Staff College on mountain warfare, based on our experience in the Himalayas. I toured the battle zone in the North-East to study the terrain and the course of operations that had recently taken place there.