Katyusha fire as ambient sound maybe. I don't think that the maps will be big enough to feature on map artillery.
at last not a highly inaccurate long range rocket artillery barrage
maybe mortar fire
mortars are not nearly as fun as katiushkas ><
Sure, Katyushkas would be very dramatic addon. But not a realistic one. They were used for "strategic" bombardments, since the accuracy is so poor. They could not be used effectively on close presence of own troops. And since own troops are allways very close of the fire mission target area in game, it