battle of antietam primary source

Before going into battle a soldier needs to prepare. To wear the proper armour and get hold of a shield and sword. The armour protects from harm as well as the sword kills the not so good guy. You also have to be fighting fit. It's the same if you battle against yourself. You need protection from dangerous illusions and also to be equipped with right knowledge and understanding. The name Opal comes from three sources. One is the Latin word "Opalus". The second one is from your Greek word "Opalliois" meaning a difference of colour lastly from your ancient Sanskrit word "Upala" meaning precious stone. If one speaks of gemstone over these tongues the saying Opal would be Opallious upala, which suggests precious stone.Which shows of assorted colours when shifted against light.