Topic summary
Field armies
Extracted from the Wikipedia article Field army.
History
Specific field armies are usually named or numbered to distinguish them from "army" in the sense of an entire national defence force or land force. In English, the typical orthographic style for writing out the names of field armies is word numbers, such as "First Army"; whereas corps are usually distinguished by Roman numerals (e.g. I Corps) and subordinate formations with ordinal numbers (e.g. 1st Division). A field army may be given a geographical name in addition to or as an alternative to a numerical name, such as the British Army of the Rhine, Army of the Potomac, Army of the Niemen or Aegean Army (also known as the Fourth Army).