From daybreak to the time of evening prayer, a fierce battle ensued, and a great number of Khalji's army were killed or wounded.

Historically, Bengal had trade relations with Tibet along the 'Tea-Horse Route', through Assam, Sikkim and Bhutan, to parts of China and Southeast Asia, which were home to gold and silver mines.

After marching for 16 days through the Teesta river area in North Bengal and Sikkim,[10] Khalji's army reached the Chumbi valley and started looting Tibetan villages.

[10] The rugged Himalayan mountain passes of Tibet were an unfamiliar terrain to the invading army, who were more used to the sultry and humid plains of Bengal.

[10][9] After crossing the river, Ali Mech guided Bhaktiyar Khilji back to Devkot (present-day Dakshin Dinajpur district, West Bengal).