ThorHa wrote:your infantry should sit in restricted terrain backed by arty
There's no question that in these conditions losses are generally minimal.
However, the AI doesn't always hold off attacking, especially in poor weather, or may decide to attack other nearby units, thereby soaking up all the remaining ammo in the defending artillery (which can be difficult to resupply if the weather stays bad). Once the artillery backup is out of ammo you soon find out how dangerous experienced 43 infantry vs infantry combat is. There's a reason why I keep pointing out how good ammo heroes would be!
The other thing is that with a lot of fast armour units with decent soft attack available, and the dreaded SMG infantry, then if you do get caught you tend to get caught badly as everything within reach comes to the party. The +3D hero can (did) make the difference between a 3 or 4* artillery unit running away at 1 strength and being completely lost along with 4* of experience.
The good news is that after losing a couple of pioneers in early 43 I have since then managed to avoid loss of experienced units and get the reformed ones enough experience to be able to fight in the front line again.