ORIGINAL: GetAssista
ORIGINAL: BBfanboy
I have never seen it happen myself, and I do a lot of naval bombardment. E.G., once I killed the Truk Naval Fort, there has been 0 return fire from the LCUs still there even though I let the bombardment TFs go all the way in (Escorts Bombard, standoff range 1). Mines were swept as soon as the Naval Fort was toast. Truk was still firing AA so it had supply.
I ran a small test and stand corrected - I was not able to provoke regular field arty battalions as long as there were no naval guns as devices involved. It's not about the units though, it is about the guns. Many of the base forces and some allied ART units have the guns that are designated as Naval in the DB, those do return fire.
Late game, the USMC receives a couple of "sea-coast artillery" battalions. They are armed with 24 155mm Long Tom field guns (device 1161). Stats are range 25, acc'y 25, pen. 80, effect 95. a-a is 69, a-s 47. It is a type 19 - Army Weapon.
That weapon can be contrasted with the 155mm M1A1 GPF (device slot 1144) which is the ultimate upgrade for all US CD weapons up to 6" calibre. Its numbers are range 25, acc'y 53, pen 140, effect 110, a-a 80 & a-s 52. It is a type 18 - Naval Gun.
As far as I can tell, both these weapons are 155mm Long Toms. After a bit of googling, I suspect the CD version is modeled as using AP ammo (actually the M112 APBC/HE round), where the Army weapon only gets M101 HE rounds.
Could you put some of each in your sandbox and see who fires? A second test would be to clone the 155mm M1A1 GPF and change it to type 19 and see what happens.
The other thing to test is whether accuracy ratings play a part. No US field artillery has an accuracy rating greater than 16 - except the Long Tom, at 25. No 'naval gun' has an accuracy less than 16 (and most are substantially higher). This may be merely coincidental.