Narwhal created four informative guides to understanding the way that the game engine works during combat in AJE. Unfortunately, the recent change of forum software has broken many links, and the links to Narwhal's threads are among them.
By using the forum's "search" function, I've been able to find their original threads. I've created links to the four guides, for anyone who's interested.
How Frontage Works
How Targeting is Determined
Guide to the Combat Fire Phase
Guide to the Combat Melee Phase