Related Rule
India
Practice Relating to Rule 20. Advance Warning
The Report on the Practice of India refers to several pieces of legislation which provide that warning must be given before use of force for the maintenance of public order. 
Report on the Practice of India, 1997, Chapter 1.6, referring to Armed Forces (Special Powers) Act, 1958, Punjab Disturbed Areas Act, 1983, Armed Forces (Punjab and Chandigarh) Special Powers Act, 1983, and Armed Forces (Jammu and Kashmir) Special Powers Act, 1990.