The tourniquet is considered by many to be one of the most significant inventions in the history of surgery, having saved millions of soldiers and trauma victims. The earliest documented methods of blood control emerged in ancient India, as evidenced by Sushruta's ligatures, and referenced by Roman medici for vessel tying and cauterisation, in addition to external limb binding. Medieval and Renaissance barber-surgeons utilised tight bands, and in the 18th century, Jean-Louis Petit developed the screw tourniquet. The evolution of emergency care has been characterised by significant developments, with innovations ranging from Esmarch's elastic bandage to modern C-A-T devices.