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AD&D expansion rules for large-scale battles with miniatures.
The First edition of BattleSystem was a boxed set, and contains a 32-page rule book, a 24-page scenario book, a 16-page Guide to Miniatures, 2 Player Aid cards, 2 metal miniature generals, 3-D Adventure Fold-Up figures, Army Roster sheets, and 801 die-cut counters. It incorporates rules for large-scale wars, as well as additional rules for miniatures use (thanks to Adrian Newman for this info). The included metal miniatures were apparently randomly culled from TSR's own character-class miniature sets, and were presumably surplus (thanks to Ed Jendek for this info).
The Second edition of BattleSystem is simply a 128-page softcover manual.
The expansion BattleSystem: Skirmishes is designed for smaller-scale
combat, where each miniature represents a single unit (thanks to Dan Harshman
for this info).
BattleSystem: Skirmishes had but a single printing, in 1991 (thanks to Adrian Newman for the scan).
Both versions of BattleSystem are fairly common; BattleSystem: Skirmishes is slightly more uncommon.