- Russian units are NKVD garrison and have a morale of 125 (o more).
- German has two 75 inf. guns.
- New mod for mortars and on board artillery guns
They no not need to make a radio contact, but may only make indirect fire to a tile that any friendly unit has LOS (not need to be spotted the tile just a LOS) at the time of the fire.
So, if you could not indirect fire a tile, move a units to spot the area, and then, the artillery might be able to make fire there.
Indirect fire to invisible areas was not much effective, only useful with large barrages like naval, heavy battery or aerial bombards. I always found that the BA indirect fire made with mortars, Priest, Wespe,etc., have a too much effect, and give a non real behavior to a tactical game. No risk at all, and demolishing effect.
Remember also, that artillery and mortars can not fire from inside a cover tile, like a building or a bunker.