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From AGEWiki

For group of units. A collection of Units or composed units (Divisions or Brigades in AACW, NCP, RoP, VGN). Groups merge into another group.

Also know as a Stack or a Force. As an option, stacks of a same region or a same city can be represented on the map included into a sole figure.

A high rank general can be a Army or Corps leader; his group is the Army or Corps, which are both special forces.