Some of these rockets passed from the front of the British columns to the rear, inflicting injury and death as they passed. Sharp bamboos were typically affixed to the rockets, which were designed to bounce along the ground to produce maximum damage. Two of the rockets fired by Tipu's troops in 1792 war are on display at the Royal Artillery Museum in London.
http://ummid.com/news/2011/October/03.10.2011/tipu_sultan_n_rocket_tech.htm
http://ummid.com/news/2011/October/03.10.2011/tipu_sultan_n_rocket_tech.htm