Am I right in thinking that a unit can't shoot through (into and out of) a 3cm(~9m) thick area of woodland, but it can shoot 10cm(~30m) into a wood?

This doesn't seem right?

30m seems a bit much (especially at longer distances where the distance effectively increases due to the 'elastic' scale), what do others think?

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You can't shot through 1cm of terrain.

Its one of those rules that may not exactly make sense, but keeps the game playable.

You can also look at it from an abstract perspective in that that 3 cm wood might have a dip directly behind it etc so troops. Table tops are flat, battlefields aren't. Woods may be thinner of foliage than others etc <shrug>