Counter-Charge

Use this Strategem in your opponent's Charge phase. Select 1 Space Wolf unit from your army. Until the end of that phase, that unit can perform a Heroic Intervention as if it were a character. Also, it can perform a Heroic Intervention if any enemy units within 6" of it, instead of 3" and can move up to 6".
To the Space Wolves, attack is the best form of defence.