the Koreans with the aid of Ming China. Japan, using overwhelming firepower, had many early victories on the Korean peninsula's. Though the Korean's had similar manpower, "the curtain of arrows thrown up by defenders was wiped out by (Japanese) gunfire." After the Japanese were finally pushed back in 1598, sweeping military reforms took place in Korea, largely based on updating and implementing the volley technique with firearms. It was Qi Jiguang, a Ming Chinese General that provided the original treatise, disseminated to Koreans, that aided in this venture. In these manuals, Qi "...gave detailed instructions in the use of small group tactics, psychological warfare, and other 'modern' techniques." Qi emphasized repetitive drilling, dividing men into smaller groups, separating the strong from weak. Qi's ethos was one of synthesizing smaller groups, trained in various tactical formations, into larger companies, battalions and armies. By doing this they could "operate as eyes, hands, and feet..." aiding to overall unit cohesion. Modern technologies At the start of the World Wars, various nations had developed weapons that were a surprise to their adversaries, leading to a need to learn from this, and alter how to combat them. Flame throwers were first used in the First World War. The French were the first to introduce the armored car in 1902. Then in 1918, the British produced the first armored troop carrier. Many early tanks were proof of concept but impractical until further development. In World War I, the British and French held a crucial advantage due to their superiority in tanks; the Germans had only a few dozen A7V tanks, as well as 170 captured tanks. The British and French both had several hundred each. The French tanks included the 13 ton Schneider CA1, with a 75 mm gun, and the British had the Mark IV and Mark V tanks. On December 17, 1903, the Wright Brothers performed the first controlled, powered, heavier-than-air flight; it went 39 meters (120 ft). In 1907, the first helicopter flew, but it wasn't practical for usage. Aviation became important in World War I, in which several aces gained fame. In 1911 an aircraft took off from a warship for the first time. Landings on a cruiser were another matter. This led to the development of an aircraft carrier with a decent unobstructed flight deck. Chemical warfare exploded into the public consciousness in World War I but may have been used