"Small wonder that we find them flocking everywhere ahead or with or in the wake of Islamic armies. Sufis of the Chishtîyya silsila in particular excelled in going ahead of these armies and acting as eyes and ears of the Islamic establishment. The Hindus in places where these sufis settled, particularly in the South, failed to understand the true character of these saints till it was too late. The invasions of South India by the armies of Alãu’d-Dîn Khaljî and Muhammad bin Tughlaq can be placed in their proper perspective only when we survey the sufi network in the South. Many sufis were sent in all directions by Nizãmu’d-Dîn Awliyã, the Chistîyya luminary of Delhi; all of them actively participated in jihãds against the local population."