in roads into East Pakistan prior to 3 December. Most notable was Brigadier Pran Nath Kathpalia’s 71 Mountain Brigade, which had pushed to the outskirts of Thakurgaon by the eve of war. Efforts to capture the heavily fortified border village of Hilli, however, failed repeatedly in a struggle that raged off and on from 24 November to 11 December. Resolutely defended by Pakistani 4 Frontier Force, Hilli blocked the proposed advance of 20 Division across the narrow “waist” of this sector.