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Hello

I encountered strange situation. As France I have moved number of fleets to London BB, to block few English AI fleets.
However during GB naval phase they are leaving port without BB battle.

Interface shows that fleets are in the same area (GB in port and FR BB), all french fleets have black box in the corner
I have setup manually standing orders for all fleets to intercept all, do not evade, and was trying both - only this area/all eligible

During GB naval phase London area is highlighted in yellow border, so it seams that there is somekind of battle, but nothing is reflected in the report window. After GB phase, their fleet is placed in english channel.

Any thoughts how this should work ?

br

I'm further testing naval battles mechanics, and to be honest I'm puzzled.

Again BR AI fleets stack is blocked
During GB naval phase they are running a blockade, and naval battle occurs. Die roll shows 25% losses on both sides. But I do not understand how they are calculated... for sure it is not 25%...
Moreover, FR is called a winner, although lossing more ships.. but GB is allowed to retreat to different port...
Do you think it is as intended or a bug ?

Short answer is no, this is not intended. Resolving issues with running blockades and lifting blockades has been challenging, and apparently we're not done yet. #1 is I don't see why GB had to evacuate Portsmouth since they control the port city. #2 is the combat result for 25% losses not looking right with the number of ships lost. #3 is with FR being declared winner with more losses; probably a logic error for the game log message. But as a run blockade battle, GB as winner would be allowed to leave port and proceed to another port. If GB lost then they should remain in port, or scuttle the fleets if the port city is enemy controlled. I'll investigate this some more. If you continue testing naval battles and get this again, I could use a good game save to review. Thanks!

FYI, I set up and ran a couple of test cases where the AI French fleet must evacuate Brest and run the blockade against human Great Britain. In both cases, the math now appears correct.

1. 49:56, EIA
Defender rolls 15%, 56 x 0.15 = 8.4 = 8 Attacker losses, Attacker rolls 10%, (49 - 8) x 0.10 = 4.1 = 4 Defender losses.
2. 44:68, EIH
Defender rolls 25%, 68 x 0.25 = 17.0 = 17 Attacker losses, Attacker rolls 25%, (44 - 17) x 0.25 = 6.75 = 7 Defender losses.
Attacker took 12 Hvy and 5 Lt for 17 losses. Defender took 6 Hvy and 1 Lt for 7 losses.

In your game, it was 71:89, EIA. Defender rolled 25%, 89 x 0.25 = 22.25 = 22 Attacker losses, Attacker rolled 25%, (71 - 22) x 0.25 = 12.25 = 12 Defender losses. AI Attacker only took 10 losses, not 22 as calculated. Human Defender took 12 losses as calculated. The problem here was in how the AI took casualties. This has been fixed. Running these test cases allowed me to verify AI naval casualties and make some adjustments. I think we're good now. The math here, as shown, is complicated by the attacker taking losses first based on defender's initial strength, and then the defender taking losses based on the attacker's adjusted strength after losses. Yeah, it makes my head hurt too...

Case 1.
1805, Jan Great Britain WINS BATTLE Of Brest
1805, Jan France Loses 2 PP
1805, Jan France II Hvy Flt Scuttled
1805, Jan France I Hvy Flt Scuttled
1805, Jan France Loses 2 PP
1805, Jan Gb Nelson PSA Bonus +1 PP To Great Britain
1805, Jan Great Britain Gains 2 PP
1805, Jan Great Britain WINS!
1805, Jan Great Britain Casualties: 4 Heavy Ships
1805, Jan France Casualties: 8 Heavy Ships
1805, Jan Great Britain Die 3(1), Perc 15%
1805, Jan France Die 2, Perc 10%
1805, Jan Great Britain Has Wind Gauge!
1805, Jan Wind Gauge: Automatic!
1805, Jan Great Britain, Nelson, 2 Fleet(s), 56 Ships
1805, Jan France, 2 Fleet(s), 49 Ships
1805, Jan NAVAL BATTLE: France Attacking Great Britain At Brest
1805, Jan France Fleets MUST Evacuate Brest And Are Forced To Run Blockade!
1805, Jan France Evacuating Port Of Brest

Case 2.
1805, Jan Great Britain WINS BATTLE Of Brest
1805, Jan France Loses 4 PP
1805, Jan France I Trn Flt Scuttled
1805, Jan France I Lt Flt Scuttled
1805, Jan France II Hvy Flt Scuttled
1805, Jan France I Hvy Flt Scuttled
1805, Jan France Loses 3 PP
1805, Jan Gb Nelson PSA Bonus +1 PP To Great Britain
1805, Jan Great Britain Gains 3 PP
1805, Jan Great Britain WINS!
1805, Jan Great Britain Casualties: 6 Heavy Ships 1 Light Ships
1805, Jan France Casualties: 12 Heavy Ships 5 Light Ships
1805, Jan Great Britain Die 6(1), Perc 25%
1805, Jan France Die 6, Perc 25%
1805, Jan Great Britain Has Wind Gauge!
1805, Jan Wind Gauge: Automatic!
1805, Jan Great Britain, Nelson, 3 Fleet(s), 68 Ships
1805, Jan France, 4 Fleet(s), 44 Ships
1805, Jan NAVAL BATTLE: France Attacking Great Britain At Brest
1805, Jan France Fleets MUST Evacuate Brest And Are Forced To Run Blockade!
1805, Jan France Evacuating Port Of Brest

Thanks for the info, good you have solved up losses issue without a savegame, because it appers I have overwritten it and I could not replicate it.

I have savegame which shows British AI fleet slipping blockade (first described issue). It is saved on the end of French phase and in next BR naval phase they are leaving blockaded port without interception.

another strange behaviour of AI fleet - Russian fleet blockaded in empty ally port in its land phase is claimed to be forced to evacuate and blockade box battle happens but with empty russian fleet, which then retreats unharmed after the battle

here is savegame at the end of FR land phase

ps Russian fleets also consistently sail of blockaded ports without being intercepted

pdzun wrote: Wed Mar 18, 2026 2:05 pm another strange behaviour of AI fleet - Russian fleet blockaded in empty ally port in its land phase is claimed to be forced to evacuate and blockade box battle happens but with empty russian fleet, which then retreats unharmed after the battle
ps Russian fleets also consistently sail of blockaded ports without being intercepted

Good catch. Something I did back in v1.25.03 regarding area_evacuate_illegal_units wasn't correct and caused the AI Russian fleet to evacuate an allied port. That's fixed now and I'll roll it into v1.27.04 for the update. Matrix won't get to it until next week some time anyway.

Regarding your PS comment, the run blockade battle happened and the AI Russian fleet lost, which meant it should have retreated back into port or been scuttled. I'm not sure why that didn't happen, but with the fix it shouldn't have had to run the blockade in the first place. With other port evacuations seeming to work OK, I don't want to mess with that here. But in cases where a fleet retreats to another port, it isn't subject to interception. So, are you seeing any run blockades without battles, or any regular naval moves at sea without interception rolls? If you get a case ike that, I'd appreciate a game save. Thanks!

Hi

Thanks for the answers.

Please check savegame attached two posts above (france_naval2) -it shows case of slipping blockade in London without being intercepted (it happend quite often on my playthrough, so maybe i'm doing something wrong while trying to blockade port)

Br

pdzun wrote: Wed Mar 18, 2026 8:53 pm Please check savegame attached two posts above (france_naval2) -it shows case of slipping blockade in London without being intercepted (it happend quite often on my playthrough, so maybe i'm doing something wrong while trying to blockade port)

I may have fixed this with the other issue? I ran your save in both my development and release versions and the British fleets stayed in London. So, good confirmation that the other fix is doing some good.

Ok, thank you, I'll wait for official patch then