Battle of Thermopylae

The Persian army was predominantly light-armed infantry.

An excerpt from the article 31 facts about Battle of Thermopylae

Soldiers were equipped with a simple long sword (akinakes), a short spear, and a bow, which, along with the arrows, was hidden in a gorytos (archery case). The Persians relied primarily on archers, so little attention was paid to armaments used for hand-to-hand combat. Shields were mainly made of reeds, which were combined with a piece of leather, which provided cover from arrows, bit not from cuts. Most Persian warriors had no armor, only tunics, which did not protect against enemy blows.