A war ensign, also known as a military flag, battle flag, or standard, is a variant of a national flag for use by a country's military forces when on land. The nautical equivalent is a naval ensign. Under the strictest sense of the term, few countries today currently have distinct war flags, most using a flag design that is also the state flag or general national flag for this purpose.
The use of flags as field signs apparently emerges in Asia, during the Iron Age, possibly in either China or India.flag. (2008). Encyclopædia Britannica. Chicago: Encyclopædia Britannica. in Achaemenid Persia, each army division had its own standard, and "all officers had banners over their tents".E. Pottier, Douris, London, 1909, p. 105 fig. 20, Plate XXV.b Early field signs that include, but are not limited to a flag, are also called vexilloid or "flag-like", for example the Roman Eagle standard or the Draconarius of the Sarmatians. The Roman Vexillum itself is also "flag-like" in the sense that it was suspended from a horizontal crossbar as opposed to a simple flagpole.
Use of simple flags as military ensigns becomes common during the medieval period, developing in parallel with heraldry as a complement to the heraldic device shown on shields. The maritime flag also develops in the medieval period. The Muromachi period Japanese Sashimono carried by foot-soldiers are a parallel development.
Some medieval city state or Medieval commune did not have coats of arms, and used war flags that were not derived from a coat of arms. Thus, the city of Lucerne used a blue-white flag as a field sign from the mid 13th century, without deriving it from a heraldic shield design.
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