A new headache has arisen for the Indian army. The Chinese may have diplomatically remained neutral during the Kargil crisis, but on the ground, its forces continue to needle the Indian side. In the Tawang area of Arunachal Pradesh, where the main battle took place between the two countries in '62, Indian army authorities are not taking any chances. For the past two months, field commanders under the Tezpur-based 4 Corps are involved in sand-model war games. The idea, as a senior officer put it, is to be in a state of constant alertness. The exercise was long overdue, top officers say. They point out that bulk of the troops under the 5 Mountain Division based in Tenga, 21 Division based in Rangiya and 2 Mountain Division based in Dinjan, have been involved in counter-insurgency operations in Assam since '91.