I've been testing WIA 1775 campaign repeatedly lately, playing British and watching the Yankee AI (normal difficulty, activation and aggression, extra time for AI, low FOW advantage). Here are some observations from that particular scenario & side which I hope prove useful should anyone take a stab at improving Athena's performance. I wish my skills were up to the job, but having taken some time with the AI database files I have to conclude I'm never going to be WIA's Clovis. (Please note that I'm aware of the limits of even the best AI, not asking for miracles, certainly not whining, simply offering experience in the hope it's useful).
First, under 1.05 the AI is much improved - don't know what the "AI help events" in this patch consisted of, but they certainly made a difference. Where the Athena was almost totally passive after the first few turns, with her main forces just sitting in certain strategic cities (especially Philly) and waiting like a deer in headlights, she is now quite busy throwing counter-punches.
Unfortunately, the campaign is still not much of challenge - after the first 12-15 months I routinely manage to dominate the game, which becomes a military procession to victory interrupted by bouts of Yankee whack-a-mole. The main problems seem to be as follows.
Failure to Regroup: Athena will reliably concentrate a good-sized force under Washington, but if (when) this main army is defeated she doesn't seem to know how to regroup. I rarely see another large army after defeating the first, even years later after plenty of time to rebuild and reconcentrate troops. Instead, from that point on Athena will rely on a scattering of smallish forces in various theatres.
Misuse of leaders: Often related to the above point, after the initial engagements Athena doesn't seem programmed to do what a human would do, pull back the remnants or at least the commanders to form a new main force. Instead, Washington will continue to command an ever-shrinking army in a single region, sometimes past the point of absurdity. In my most recent game, he was defeated in Maryland in mid-1776 and driven into the Virginian Appalachians to watch the remnants of his army starve through the winter, spent most of the next campaign leading a handful of units in the same vicinity until tracked down and destroyed utterly, and then suddenly reemerged some time afterward leading an Indian war-party in a raid on Presque-Ile (of all things!). The obvious course would have been to withdraw him and whatever was left of the Continental Army to the Hudson Valley or New England and draw together another field army. Lesser leaders like Gates or Howe behave the same way - once their initial field force is beaten, they hang around leading a few regiments of militia in futile raids on British garrisons.
Dispersal of effort: Granted, AI is never good at long-range planning, but not uncommonly resources which might have been capable of prying a strategic town or two free if they had been concentrated on a single region instead get used in penny-packets - the result in the mid-game is whack-a-mole, with little groups of rebels popping up, only to be run down by my ranger-indian-dragoon columns.
What can be done about these related problems? Is there a parameter for force concentration which applies across the board and which can be adjusted slightly - not too much, since some small-scale raiding is valuable in tying down British garrisons? Is it possible to beef up a "self-preservation" AI routine which would direct the AI logic to pull out of an area and run for cover when nearby enemy forces are overwhelming? Or perhaps a single recurring event can direct Washington to the largest Yankee stack if his own falls below a certain strength, which would at least keep him from wasting his talents leading Indian raids?
Again, I'm not expecting miracles - but it would be a shame if WIA's AI wasn't at least up the standard of AACW, and at the moment I don't believe it is. Finally, even if I can't make sense of the AI files, if there's something I can do to help improve the game, I'm ready and willing.