Standard map symbol for a numbered army. The four 'X's are indicative of an army, and do not represent army's number; the army's number, if included, would be written numerically to the left of the symbol.
A Field Army, usually referred to simply as an Army, is a term used by many national military forces for a formation superior to a corps and beneath an army group. Sometimes, we can name it Area Army, such as: the Japanese First Area Army(第1方面軍,Dai-ichi hōmengun?).
A Field Army is composed of a headquarters, and usually controls at least two corps, beneath which are a variable number of divisions. A battle is influenced at the Field Army level by transferring divisions and reinforcements from one corps to another to increase the pressure on the enemy at a critical point. Armies are controlled by a General or Lieutenant General.
A particular army can be named or numbered to distinguish it from military land forces in general. For example, the First United States Army and the Army of Northern Virginia. In the British Army it is normal to spell out the ordinal number of an army (e.g. First Army), whereas corps use Roman numerals (e.g. III Corps) and lower formations use figures (e.g. 1st Division).
Armies (as well as army groups and theaters) are large formations which vary significantly between armed forces in size, composition, and scope of responsibility.
