Yeah, Kriegsmarine is definitely not the best DLC to start playing and learning the mechanics. Boot Camp followed by US Pacific campaign is the best tutorial. You can take over your units from Boot Camp to the US campaign what is a nice feature, although you need to repurchase them with some experience loss.
Ships loose only efficiency until the next turn if you make emergency repairs below 5 or 4 left strength. Also if a support ship repairs another ship then both loose temporarily efficiency. Otherwise, ships never loose efficiency.
Planes loose efficiency if the air supply value is dropping below the coverage, like loosing/damaging airfields/airstrips or carriers/tenders which normally only give air supply. It's however also possible that some maps have set off-map air supply enabled that you don't even need any airfields but only exit/redeployment hexes on the map. Recon planes normally also don't bother about air supply with limitless fuel.
Engineering units, like Engineers, Seabees, and Bautruppe, can restore airfields should they be damaged by strategic bombers. Just let them sit on the hexes to slowly restore 1 supply per turn.
Same with carriers by Port hexes or worse Support Ships. This should increase the damaged air supply again and raise every plane's efficiency value again.
You can see on the combat result test examples below that efficiency loss during direct combat for ground combat is quite obscure how much you can loose and not, depending on experience and defense values.
Code: Select all
- Unreliable-trait units have a 50% chance to lose 2 efficiency points (20) when moving, no matter how far
- Unreliable-trait units lose 1 additional efficiency point (10) when attacking or defending (modified by experience and combat results somehow)
- reliable 0-star: Atk 10 vs. Def 99: 9,8,7,6,5,4,3,2,1,0
- reliable 0-star: Atk 10 vs. Def 10: 9,9,9,9,9,9,8,...
- unreliable 0-star: Atk 10 vs. Def 99: 8,6,4,2,0
- unreliable 0-star: Atk 10 vs. Def 10: 8,7,6,4,3,2,1,0
- unreliable 5-star: Atk 10 vs. Def 10: 9,8,8,7,6,6,5,5,4,4,3,3,2,2,1,1,0
- unreliable 0-star: Def 10 vs. Atk 10: 8,7,5,4,2,1,0
- unreliable 0-star: Def 99 vs. Atk 10: 8,6,4,2,0