Rules implementations that vary by rule set:

	Original	Revised	50th	1942	1940	Note
Bombardment casualties fire back
Subs are always preemptive						Otherwise destroyers negate the surprise attack.
Air always hits subs						Destroyers allow planes to hit subs.
Transports must be taken last						If possible.
Aircraft Carriers take 2 hits

Notes:

• Bombers as defenders are ignored in sea battles.
• Destroyers in amphibious assaults are considered to have Combined Bombardment tech.
• Mech infantry also get a bonus with artillery 1:1 (from 1940 FAQ).
• 50 edition rules heavy bombers select the highest of 2 dice rolls (from 50th Anniversary FAQ).
• Must Take Territory option is ignored for sea battles.
• 1940s Anti-Air Gun units are ignored on the attacking side.

Info:

Order of Loss-

• You may enter a string of characters as OOL.
• Each unit has a hilighted letter that can be used.
• If you do not enter an OOL, the default OOL will be used.
• If you get an error like "OOL string is missing 'A'", it means that you have added units but you need to specify them in the OOL string as well.

Rulebook links:

• General Rules Page http://www.wizards.com/default.asp?x=ah/downloads
• Original http://www.wizards.com/avalonhill/rules/axis.pdf
• Revised Rulebook http://www.wizards.com/avalonhill/rules/axis2004.pdf
• Anniversary Edition (50th) http://www.wizards.com/AvalonHill/rules/AxAl-AnEd_Rules.pdf
• 50th FAQ http://harrisgamedesign.com/pdf/A&A_Anniversary_FAQ.pdf
• 1942 http://www.wizards.com/avalonhill/rules/AVL1942_RuleBook.pdf
• 1940 http://www.wizards.com/AvalonHill/rules/AVL1940_RuleBook.pdf
• 1940 Alpha 3 http://www.harrisgamedesign.com/phpBB3/viewtopic.php?f=40&t=6149