Greenhill's Alternate Decisions is a series of books published by Greenhill Books. The books are anthologies of essays on alternate history. Some books in the series have also been published by the Science Fiction Book Club or the Military Book Club.
The series is ongoing and currently includes the following titles:
Published in 1995 and edited by Kenneth Macksey. Included the following essays:
Operation Greenbier: Defusing the German Bomb – John H. Gill
Germany and the Atlantic Sea-War: 1939–1943 – Stephen Howarth
Through the Soft Underbelly: January 1942-December 1945 – William Jackson
Bloody Normandy: The German Controversy – Tim Kilvert Jones
Operation Wotan: The Panzer Thrust to Capture Moscow, October–November 1941 – James Lucas
Operation Sea Lion: Germany Invades Britain, 1940 – Kenneth Macksey
Operation Armageddon: Devastation of the Cities, 1943 – Charles Messenger
Operation Sphinx: Raeder's Mediterranean Strategy – Bryan Perrett
The Jet Fighter Menace – Alfred Price
Operation Orient: Joint Axis Strategy – Peter G. Tsouras
Published in 2000 and edited by Jonathan North. Included the following essays:
That Most Vulnerable, and, At the Same Time, Most Mortal Part – Paddy Griffith
Bonaparte's Campaign in Egypt – Charles S. Grant
Junot's Victory in Portugal, 1808 – Philip Haythornthwaite
Decision in Bavaria: The Austrian Invasion of 1809 – John H. Gill
The Russians at Borodino – Digby Smith
The Race for the Borisov Bridge – Jonathan North
Victory at Kulm: The 1813 Campaign – John G. Gallaher
What if Constant Rebecque Had Obeyed Wellington's Order of 7 pm, 15 June 1815, and Abandoned Quatre Bras? – Peter Hofschröer
Napoleon and Waterloo – Andrew Uffindell
Ambush at Quatre Bras – John R. Elting
Published in 2001 and edited by Peter G. Tsouras. Included the following essays:
Hokushin: The Second Russo-Japanese War – Peter G. Tsouras
Be Careful What You Wish For: The Plan Orange Disaster – Wade G. Dudley
Pearl Harbor: Irredeemable Defeat – Frank Shirer
Coral and Purple: The Lost Advantage – James Arnold
Nagumo's Luck: The Battles of Midway and California – Forrest R. Lindsey
Samurai Down Under: The Japanese Invasion of Australia – John H. Gill
The Japanese Raj: The Conquest of India – David C. Isby
Guadalcanal: The Broken Shoestring – John Burtt
There Are Such Things as Miracles: Halsey and Kurita at Leyte Gulf – Christopher J. Anderson
Victory Rides the Wind: The Kamikaze Prevents Defeat at Kyūshū – Dennis Giangreco
Published in 2002 and edited by Peter G. Tsouras. Included the following essays:
The Little Admiral, 1939: Hitler and the German Navy – Wade Dudley
Disaster at Dunkirk: The Defeat of Britain, 1940 – Steven Badsey
The Battle of Britain, 1940: Triumph of the Luftwaffe – Charles Messenger
The Storm and the Whirlwind: Zhukov Strikes First – Gilberto Villahermosa
The Hinge: Alamein to Basra, 1942 – Paddy Griffith
Into the Caucasus: The Turkish Attack on Russia, 1942 – John Gill
Known Enemies and Forced Allies: The Battles of Sicily and Kursk, 1943 – John Burtt
Luftwaffe Triumphant: The Defeat of the Bomber Offensive, 1944–1945 – David Isby
Hitler's Bomb: Target: London and Moscow – Forrest Lindsey
Rommel versus Zhukov: Decision in the East, 1944–1945 – Peter G. Tsouras
Published in 2003 and edited by Peter G. Tsouras. Included the following essays:
First Blood: Berlin, 1948 – Michael J. Hathaway
The Pusan Disaster, 1950: North Korea's Triumph – James Arnold
Vietnam: The War that Nobody Noticed – Paddy Griffith
To the Brink: The Middle East, June 1967 – John D. Burtt
Another Savage War of Peace: Quebec, 1968 – Sean Maloney
A Fraternal War: The Sino-Soviet Disaster – Forrest R. Lindsey
To Go Boldly in Amongst Them: The Invasion of North Vietnam – Kevin F. Kiley
Fire & Ice: Sixth Fleet versus Fifth Eskadra, October 1973 – Wade Dudley
Afghanistan: The Soviet Victory – David C. Isby
Red Lightning: The Collapse of the Red Army – Peter G. Tsouras
Published in 2004 and edited by Peter G. Tsouras. Included the following essays:
Hell on Earth: Anglo-French Intervention in the Civil War – Andrew Uffindell
Ships of Iron and Wills of Steel: The Confederate Navy Triumphant – Wade Dudley
What Will the Country Say: Maryland Destiny – David M. Keithly
When the Bottom Fell Out: The Crisis of 1862 – Michael R. Hathaway
We Will Water Our Horses in the Mississippi: A.S. Johnson vs. U.S. Grant – James R. Arnold
Absolutely Essential to Victory: Stuart's Cavalry in the Gettysburg-Pipe Creek Campaign – Edward W. Longacre
Moves to Great Advantage: Longstreet vs. Grant in the West – John D. Burtt
Confederate Black and Gray: A Revolution in the Minds of Men – Peter G. Tsouras
Decision in the West: Turning Point in the Trans-Mississippi Confederacy – Cyril M. Lagvanec
Terrible as an Army With Banners: Jubal Early in the Shenandoah Valley – Kevin F. Kiley
Published in 2005 and edited by Peter G. Tsouras. Included the following essays:
Monty's D-Day: Caen and Beyond – David C. Isby
'By the Throat': Decision at Falaise – Peter G. Tsouras
Patton and the Narrow Thrust: The Ardennes Route into Germany – James R. Arnold
A Backdoor into Germany: Monty Bounces the Rhine – Andrew Uffindell
The Race to Bastogne: Nuts! – Christopher J. Anderson
Blunting the Bulge: From the Maas to the Meuse with First Canadian Army – Sean M. Maloney
Go Home, This Is Our Goddam Show! Monty Pulls It Off – Charles Vasey
Operation Herbstnebel: Smoke over the Ardennes – John Prados
Holding Patton: Seventh Panzer Army and the Battle of Luxembourg – Kim H. Campbell
Ardennes Disaster: The Iron Curtain Falls on the White House – Peter G. Tsouras
Published in 2006, edited by Peter G. Tsouras. Included the following essays:
May Day: The Premiership of Lord Halifax – Nigel Jones
Peace in Our Time: Memories of Life at Führer Headquarters – Charles Vasey
The Spanish Gambit: Operation FELIX – John Prados
Navigare Necesse Est, Vivere Non Est Necesse: Mussolini and the Legacy of Pompey the Great – Wade G. Dudley
The Health of The State: Italy and Global War – David C. Isby
Black Cross, Green Crescent, Black Gold: The Drive to the Indus – David M. Keithly
Wings Over the Caucasus: Operation LEONARDO – Paddy Griffith
To the Last Drop Of Blood: The Fall of Moscow – Kim H. Campbell
The Stalingrad Breakout: 'Raus Pulls You Through' - Peter G. Tsouras
For Want of an Island: The Fall of Malta and German Victory – John D. Burtt
Ike's Cockade: The Allied Invasion of France – Stephen Badsey
In addition to these anthologies, Greenhill has also published some book length "non-fiction" alternate history:
Invasion: The Alternate History of the German Invasion of England, July 1940 – Kenneth Macksey (1990)
Disaster at D-Day: The Germans Defeat the Allies, June 1944 – Peter G. Tsouras (1994)
For Want of a Nail...; If Burgoyne Had Won at Saratoga – Robert N. Sobel (1997)
Gettysburg: An Alternate History – Peter G. Tsouras (1997)
The Moscow Option: An Alternative Second World War – David Downing (2001)
Luftwaffe Victorious: An Alternate History – Mike Spick (2005)