During the 13th century, it was the frequently used route by Ahoms, a Shan tribe, for their arrival and settlement in Assam in India.

[citation needed] In the 19th century, British railway builders had surveyed the Pangsau Pass, which is 1,136 metres (3,727 feet) high on the India-Burma border, on the Patkai crest, above Nampong, Arunachal Pradesh and Ledo, Tinsukia (part of Assam).

Although the proposal was dropped, the British prospected the Patkai Range for a road from Assam into northern Burma.

168–195 The Stilwell Road began at Ledo, Assam, the railhead, and passed through Tirap Gaon, Lekhapani, Tipong, Jagun, Jairampur (the Assam-Arunachal Pradesh boundary and beginning of Inner Line), and Nampong before switchbacking steeply upwards through densely forested hills to the pass, 12 kilometres (7.5 mi) away.

[3] The Pangsau Pass Winter Festival since 2007 is a joint India-Myanmar 3 day annual global village event organized during the 3rd week of January every year in Nampong, Arunachal Pradesh.