- Canadian Armed Forces ensign
- War flag of the Republic of China Armed Forces
- Flag of the Iranian Army
- War flag of the Korean People's Army of North Korea
A war ensign, also known as a military flag, battle flag, or standard, [1] 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.
Sound trumpets! Let our bloody colours wave! And either victory, or else a grave.
— Edward, Prince of Wales, in Henry VI, Part 3 , Act II, Scene II
Field signs were used in early warfare at least since the Bronze Age. The word standard itself is from an Old Frankish term for a field sign (not necessarily a flag).
The use of flags as field signs apparently emerges in Asia, during the Iron Age, possibly in either China or India. [2] in Achaemenid Persia, each army division had its own standard, and "all officers had banners over their tents". [3] 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 dragon standard 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 medieval Japanese Sashimono carried by foot-soldiers are a parallel development.
Some medieval free cities or communes 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.