Aquila (Roman)

To lose a standard was seen as extremely grave, shameful and dishonorable, and the Roman military went to great lengths both to protect a standard and to recover one had it been lost; after the annihilation of three legions in the Teutoburg Forest, the Romans spent decades retaliating for the defeat while also attempting to recover the three lost eagles.

[2] The most ancient standard employed by the Romans is said to have been a handful (manipulus) of straw fixed to the top of a spear or pole.

[3][4] Pliny attributes to the consul Gaius Marius the setting aside of the four quadrupeds as standards and the retention of the eagle (Aquila) alone after the devastating Roman defeat at the Battle of Arausio against the Cimbri and Teutons in 104 BC.

It was made of silver, or bronze, with upwards stretched wings, but was probably of relatively small size, since a standard-bearer (signifer) under Augustus is said in circumstances of danger (the Teutoburgerwald battle) to have wrenched the eagle from its staff and concealed it in the folds of his tunic above his girdle.

[5] Pliny's claim is refuted by sources showing late republican and early imperial legions with other animal symbols such as bulls and wolves.