Mongol invasion of India (1303)

In 1303, a Mongol army from the Chagatai Khanate launched an invasion of the Delhi Sultanate, when two major units of the Delhi army were away from the city. The Delhi Sultan Alauddin Khalji, who was away at Chittor when the Mongols started their march, returned to Delhi in a hurry.

Source: Wikipedia — Mongol invasion of India (1303) (CC BY-SA 4.0)