One dirty trick is consider something can Hit and Run, like White Scar Bikers, tie up their Warriors or Destroyers in assault, which stops them tomove onto objectives, HnR in the end of his assault phase last turn and turbo boost to your objectives. Just remember 1. Stay away from Paetorians, Lychguards and Scarabs large enough in numbers; and 2. Just make sure you haven't made the Lady Luck and Dice God unhappy
, or you will roll 1s and 2s in your armor saves, followed by rolling 5 or 6 in your HnR check or the morale check IN YOUR OWN ASSAULT PHASE
. These kind of dice rolling had costed me many games in the past.