Who was the group of soldiers that stood in a square to fight Calvery or phanax?

The group of soldiers that stood in a square formation to fight cavalry was known as the "phalanx." This ancient military formation, predominantly used by Greek hoplites, consisted of heavily armed infantry soldiers arranged in a tight, rectangular formation. The phalanx was designed to present a solid front against enemy charges, including cavalry, by utilizing overlapping shields and long spears (sarissas) to create a formidable barrier.