Drifting artillery

[Griefbringer]

Remember that the Z-fire can easily drift a hex or two, so it is not totally safe to your own infantry near-by.

Another thing with using big guns against forest hexes is that they may start fires. If you are planning to advance through a particular area, then forest fires are likely to be bad news, since they tend to cause suppression and thus slow down your advance (which will already be slow).

On related note, using very big guns (large enough to cause holes) against forest hexes is likely to also slow down the advance, since most units will end up moving only a hex or two per turn in such terrain.