Column shift for 3 units in a hex

[Memenne]

Hi guys,

please apologize if my question looks silly and the answer is obvious.
But it is not for me.

The attacker direct fires with infantry units in a hex where you have two infantry units and a tank.

In my opinion, the firer gets the column shift for 3 units in a hex only if it could obtain a "X" result on the firetable (as this is the only possibility to hurt the tank).
That means this is not possible under 7 FP (or 16 FP for Bombardment).

Am I right ?

Thank you,
Manu