Psychiatric and substance abuse hospitals employed only 3,210 security guards, according to the BLS, less than 8 percent of all hospital guards. However, they were the best paid in the industry, earning an average of $35,000, or $16.83 an hour.
So the basic differences between Cavalry, Artillery and Infantry are as follows. 1  Infantry: Infantry refers to the soldiers on foot. 2  Cavalry: It generally means mounted soldiers. 3  Artillery: It uses large and long ranged weapons.
The Persian Cavalry was crucial for conquering nations, and had maintained its importance in the Achaemenid army to the last days of the Achaemenid Empire. The cavalry were separated into four groups. The Chariot Archers, Horse cavalry, the Camel cavalry, and the Elephant Cavalry.