Be aware that successive editions are essentially incompatible. The main supplements are also listed here.
First edition:
Authors: Bryan Ansell; Richard Halliwell; Richard Priestley
Publisher: Citadel Miniatures
Year: 1983
+++Forces of Fantasy supplement: 1984
Second Edition:
Authors: Bryan Ansell; Richard Halliwell; Richard Priestley
Year: 1985
+++Blood Bath at Orc's Drift scenario pack one: 1985
+++Tragedy of McDeath scenario pack two: 1986
+++Ravening Hordes supplement: 1987
Third edition:
Authors: Rick Priestley; Jim Bambra
Year: 1987
+++Warhammer Siege: 1988 (Warhammer 40,000)
+++Warhammer Armies supplement: 1988
Fourth edition:
Authors: Rick Priestley; Bill King; Andy Chambers; Nigel Stillman
Year: 1992
+++Warhammer Battle Magic boxed set: 1992
+++Warhammer Arcane Magic boxed set: 1995
+++Warhammer Chronicles of War (0128)
+++Warhammer Armies - Chaos boxed set: 1994 (0136)
Fifth edition:
Author: Rick Priestley
Year: 1996
+++Warhammer Magic boxed set: 1996 (2nd ed 1997)
+++Warhammer Realm of Chaos boxed set: 1998
+++Warhammer Siege (2nd ed): 1998
Sixth edition:
Authors: Rick Priestley; Tuomas Pirinen
Year: 2000