The Silk Letter Movement (تحریکِ ریشمی رومال) refers to a movement organised by Deobandi leaders between 1913 and 1920, aimed at freeing India from British rule by forming an alliance with Ottoman Turkey, Germany, and Afghanistan. This plot was uncovered by the Punjab CID with the capture of letters from Ubaidullah Sindhi, one of the Deobandi leaders then in Afghanistan, to Mahmud Hasan Deobandi, another leader then in Iran. The letters were written on silk cloth, hence the name.[1][2]