Fathul Mujahidin is a military manual that was written by Tippu Sultan, a ruler of the Kingdom of Mysore, considered a pioneer in the use of rocket artillery. He used rockets in battle with the British Army in the 1792 Siege of Srirangapatna, a battle at the end of the Third Anglo-Mysore War.
Tipu distributed copies of his military manual to all of his officers. In the manual he defined 200 men to handle rockets within each of the Mysore cushoons, with 16 to 24 cushoons of infantry. The personnel handling the rockets were trained to define the launch angle to properly affect the curve at which the rocket would land. Tipu also defined in the manual a multiple rocket launcher (much like a musical organ) that would launch up to 10 rockets. Some of the rockets had blades in the front of the bamboo guiding rods, while others were designed as incendiary rockets.
Although not the first use of rockets by Mysore, the 1792 Siege of Srirangapatna reportedly began with showers of as many as 2,000 rockets fired simultaneously.
According to Stephen Oliver Fought and John F. Guilmartin, Jr. in Encyclopædia Britannica (2008):Hyder Ali, prince of Mysore, developed war rockets with an important change: the use of metal cylinders to contain the combustion powder. Although the hammered soft iron he used was crude, the bursting strength of the container of black powder was much higher than the earlier paper construction. Thus a greater internal pressure was possible, with a resultant greater thrust of the propulsive jet. The rocket body was lashed with leather thongs to a long bamboo stick. Range was perhaps up to three-quarters of a mile (more than a kilometre). Although individually these rockets were not accurate, dispersion error became less important when large numbers were fired rapidly in mass attacks. They were particularly effective against cavalry and were hurled into the air, after lighting, or skimmed along the hard dry ground. Hyder Ali's son, Tippu Sultan, continued to develop and expand the use of rocket weapons, reportedly increasing the number of rocket troops from 1,200 to a corps of 5,000. In battles at Seringapatam in 1792 and 1799 these rockets were used with considerable effect against the British.