Ancient and Medieval Warfare in the West: The History of Western Europe's Changing Military Tactics in Antiquity and the Middle Ages

For the Greeks, a hoplite was only as strong as the hoplite next to him; without hoplites on the sides, both flanks were exposed, and heavy infantry units are not mobile. Thus, they implemented the phalanx formation, one of history's most important military innovations. The phalanx was a line of infantry as wide across as the battlefield dictated, anything from five to 30 men deep, with each rank of men officered by a veteran. The formation also included an additional, expert file-closer a...