approach for campaigns such as Commentarii de Bello Gallico and Commentarii de Bello Civili. Technological evolution New weapons development can dramatically alter the face of war, the cost of warfare, the preparations, and the training of soldiers and leaders. A rule of thumb is that if your enemy has a potentially war winning weapon, you have to either match it or neutralize it. Ancient era Chariots originated around 2000 BC. The chariot was an effective, fast weapon; while one man controlled the maneuvering of the chariot, a second bowman could shoot arrows at enemy soldiers. These became crucial to the maintenance of several governments, including the New Egyptian Kingdom and the Shang dynasty and the nation states of the early to middle Zhou dynasty. Some of the military unit types and technologies which were developed in the ancient world are: Slinger Hoplite Auxiliaries Infantry Archery Chariots Cavalry For settled agrarian civilizations, the infantry became the core of military action. The infantry started as opposing armed groups of soldiers underneath commanders. The Greeks and early Romans used rigid, heavily armed phalanxes. The Macedonians and Hellenistic states would adopt phalanx formations with sarissa pikemen. The Romans would later adopt more flexible maniples from their neighbors which made them extremely successful in the field of battle. The kingdoms of the Warring States in East Asia also adopted infantry combat, a transition from chariot warfare from centuries earlier. Archers were a major component of many ancient armies, notably those of the Persians, Scythians, Egyptians, Nubians, Indians, Koreans, Chinese, and Japanese. Cavalry became an important tool. In the Sicilian Expedition, led by Athens in an attempt to subdue Syracuse, the well-trained Syracusan cavalry became crucial to the success of the Syracusans. Macedonian Alexander the Great effectively deployed his cavalry forces to secure victories. In battles such as the Battle of Cannae of the Second Punic War, and the Battle of Carrhae of the Roman-Persian Wars, the importance of the cavalry would be repeated. There were also horse archers, who had the ability to shoot on horseback – the Parthians, Scythians, Mongols, and other various steppe people were especially fearsome with this tactic. By the 3rd–4th century AD, heavily armored cavalry became widely adopted by the Parthians, Sasanians, Byzantines, Eastern Han dynasty and Three Kingdoms, etc. The early Indo-Iranians developed the use of chariots in warfare. The scythed chariot was later invented in India and soon