Xenocidal Maniac:

Can you show me the excerpt in the Rules please. I can not find it.

He's talking about 'A unit must use their counter charge move to move directly towards the closest enemy unit.'.

As discussed above, this can sometimes be used to stop an assault but it's pretty rare that it's possible.

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The Wargaming Trader
NetEA Death Guard Army Champion

Also note that although the silver tank is the only one that can be killed by attacks, the rest of the formation can still be removed as casualties by combat resolution kills...