The newest Bag of Tricks of the Hearts of Iron series brings us the Strategic Redeployment and Preferred Tactics mechanics. These, while not ground-shaking, are mechanics that will help with overall realism of the game.
Developers have touched on the Preferred Tactics feature briefly during a previous diary, however, due to some good feedback from the community and from inside the team, we’ve made some alterations to how it works.
Where previously, you set a preferred tactic on a national level, giving a positive chance modifier for that tactic to be chosen in combat, your generals and field marshals will now also possess the ability to earn a favored combat tactic. At level 5, you’ll be prompted to choose a preferred tactic for your generals. This represents their doctrinal school of war - a choice that affects all units under their command.
Note here, that Paradox are not removing the national preferred tactic, and that the additive weight will compound from national -> field marshal -> general. To pre-empt the question, you can of course stack all 3 as the same tactic, although this drastically reduces your flexibility, and potentially makes it very easy to be countered. The overall additions granted by preferred tactics have of course been reduced somewhat to account for this.
As for the strategic deployment, as hinted at, strategic redeployment will now make use of railways in order to simulate more realistic army relocation. This applies a different weighting to the regular pathfinder, resulting in choices that largely look sensible where routes of a similar weight are encountered.
Sometimes it becomes difficult to predict what will be considered 'sensible' in every scenario - there will be edge cases where pretty looking behaviour and logical behaviour do not overlap., so have that in mind when making plans on your war efforts, and don't be surprised if our plans do not coincide with those of the AI, as the mechanic is still a work in progress.