Gunpowder technology entered Java in the Mongol invasion of Java (1293 A.D.). Majapahit under "Mahapatih" (prime minister) Gajah Mada utilized gunpowder technology obtained from Yuan dynasty for use in the naval fleet. During the following years, Majapahit army have begun producing breech-loading cannon known as cetbang. Cetbang can be mounted as a fixed or swivel gun, small-sized cetbang can be easily installed on small vessels. In naval combat, this gun is used as an anti-personnel weapon, not anti-ship. In this age, even to the 17th century, the Nusantara soldiers fought on a platform called "Balai" and performed boarding actions. Loaded with scattershots (grapeshot, case shot, or nails and stones) and fired at close range, the cetbang is very effective at this type of fighting.