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There is no combat window, but the minesweepers will usually be hit by coastal gunfire, though it will not open a combat window, and the full extent of the exchange may not appear in the combat report of the player who owns the coastal guns.

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ORIGINAL: cardas

This isn't just based on an idle observation. I've tested it using a custom pwhexe&scenario to check that this was actually the case.

A 20 ship surface combat task force (4 BBs, 2 CAs, 4 CLs, 10 DDs) running through both narrow and wide straits. Not once were they fired on when there weren't any mines in the hex that contained the strait. The combat window opens and in the left corner where you get the "NAVAL MOVEMENT PHASE" etc. messages you get a "Naval Gun Fire at X" (X = base name) but, as I already said, nothing actually happens. Add mines to the straits and, boom, instantly the CD guns will actually start firing at the ships passing through.

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There is no combat window, but the minesweepers will usually be hit by coastal gunfire, though it will not open a combat window, and the full extent of the exchange may not appear in the combat report of the player who owns the coastal guns.

The tests I've run were done in head to head mode so I can say with certainty that they didn't receive any damage at all.

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ORIGINAL: Aurorus
Which straight hex are you referring to? I know for certain that I have run several different types of ships through Bataan into Manila with the allied coastal guns still there: both with mines at Bataan and without, and the presence of mines had no effect on whether the coastal guns fired or not. At night, in low moonlight, they often did not fire. With high moonlight, they usually fired.

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ORIGINAL: cardas

Double post but...

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ORIGINAL: Aurorus
Which straight hex are you referring to? I know for certain that I have run several different types of ships through Bataan into Manila with the allied coastal guns still there: both with mines at Bataan and without, and the presence of mines had no effect on whether the coastal guns fired or not. At night, in low moonlight, they often did not fire. With high moonlight, they usually fired.

I prefer to test stuff with a custom scenario/pwhexe so that the turn processes quicker and I can more easily control for the stuff I want. Just to make sure I didn't mess up anything I went ahead and did an extra test for your specific example though.

Stock scenario 1, played in head to head mode. Started out by standing down all air groups and task forces on both sides. Then I sent in a bunch of Japanese minesweepers to sweep Bataan and Manila. Once all mines were swept I sent a surface task force to patrol back and forth through the strait (so between Manila and one hex west of Bataan). I let that go one for about half a month (so ~15 turns), then as a finale I sent a bunch of the pre-made amphibious task forces that otherwise invades places like Kota Bharu to land directly at Manila. In addition the Kongo TF and the Mogami TF were sent along to bombard Manila. The move by these task forces through the strait at Bataan on their way to Manila was done in 95+% moonlight (don't remember exactly what it was).

I of course lost minesweepers to the guns while sweeping. Once the mines were gone however at no point did any guns fire on the Japanese ships. Neither on the surface task force that had patrolled through the strait for half a month nor the multitude of task forces that were involved in the grand finale. So my experience contradicts your claim that the guns at Bataan would fire even when there are no mines present - though you only say there were no mines at Bataan. Maybe there were mines at Manila and that is enough to trigger proper coastal gun fire? I haven't tested that specific case.

Regardless this strengthens my claim that there is a bug.