https://en.wikipedia.org/wiki/Aquila_(Roman)
An aquila (Classical Latin: [ˈakᶣɪla], "eagle") was a prominent symbol used in ancient Rome, especially as the standard of a Roman legion.A legionary known as an aquilifer, the "eagle-bearer", carried this standard.Each legion carried one eagle. The eagle had quasi-religious importance to the Roman soldier, far beyond being merely a symbol of his legion. To lose a standard was …