A military front or battlefront is a contested armed frontier between opposing forces. It can be a local or tactical front, or it can range to a theater. A typical front was the Western Front in France and Belgium in World War I.The term "home front" has been used to denote conditions in the civilian sector of a country at war, including those involved in the production of matériel.
Both the Soviet and Polish Armies used the term "front" to mean an army group during the Polish-Soviet War and World War II. The equivalent of the term established in the header was the "Theater of military operations".
The term "front line city" was used by the Germans during their long retreat from Moscow/Stalingrad to refer to metropolitan centres that had become disputed by the two combatants. Designation of a city as such resulted in administrative changes (largely the imposition of martial law). In the film Downfall, the term was briefly referenced.
The term "transferred to the front" is often used by soldiers or personnel when their position has been changed from other activities.