Did every soldier have armor in ancient times?

Of course not. Most of them have no armor. Only in the heyday of the Ming and Qing dynasties could more than half of the soldiers have armor.

For example, during the Spring and Autumn Period and the Warring States Period, only nobles and soldiers had armor, and soldiers who were qualified to wear armor were called soldiers.

One ride, one chariot, three soldiers, seventy-two soldiers. Nine husbands are wells and four wells are cities; Four cities are hills. Qiu has sixteen wells, one charger and three cows. Four hills are temples, and sixty-four wells are temples. There is a long hub, four horses, twelve cows, three soldiers and seventy-two infantry. -"The Book of Rites".

Killing the army can get the rank of knight, rewarding one hectare of fertile land, one scholar's mansion, one knight's class, one hectare of beneficial field and nine acres of beneficial house. When illegitimate children are removed, it is both the government and the people and the soldiers —— "Shang Jun's Internal Chapter". The head of a soldier who can wear armor is naturally not so easy to take.