No. Unless the unit itself or the scenario being played has a special rule that changes the way in which Ambushers arrive, you must roll for their arrival during each of your turns, from round two onwards. However, any special rules that affect the arrival of Ambushers which take effect after the Start of Turn sub-phase but before the Compulsory Moves sub-phase may be used as normal, regardless of the result of the Ambushers roll.

A rule such as Armour Bane (X) can have no effect if no roll To Wound is made. In such cases, you may choose to roll To Wound as normal in the hope of improving the weapon's AP characteristic, but if you do the effect of Poisoned Attacks is lost and you must accept the result of the roll To Wound.

No.

Yes. Counter Charge is a rule that represents the skill and ferocity of the rider, not their mount. In other words, not every rider is willing or able to perform a counter charge, regardless of their mount.

Yes. A unit that Gives Ground is not a fleeing unit.

Note that, as mentioned previously, should any part of a unit cross beyond the edge of the battlefield whilst it is Giving Ground, the entire unit is removed from play and counts as having been destroyed. It is intentional that a Drilled unit might be able to avoid this fate.

Yes. If a model has the Fly (X) special rule, the number given in brackets is essentially a second Movement characteristic. Any effect that modifies one will modify both.

No. A model that has more than one version of the Fly (X) special rule essentially has two Movement characteristics it can use when flying. Of these, you may use the best.

If it is able to use the greater, then yes, it must (tactically, you might not want it to, but a Frenzied Lord of Chaos on a mighty Dragon doesn't care about your tactics!).

No. A unit is either Frenzied or it isn't, multiple instances of Frenzy are not cumulative.

No.

The rules effectively cancel one another out, meaning the weapon would suffer a -1 To Hit modifier for Moving and Shooting.

No, because no one would hear them over the sound of them running away.

No. Whilst units that move randomly do not declare charges, if you wish to move one into contact with an enemy unit, it must fulfil the same criteria as any other charging unit during its movement, as detailed on page 126.

All units move 2" when Giving Ground.

No, armour values given as a target number cannot be combined to lower the target number. As with Ward saves, only a single Regeneration save can be attempted and different Regeneration saves cannot be combined together. If a model has more than one Regeneration save, simply use the best.

Yes. Even though the wounds were saved, they will still count towards the combat result.

No.

The unit ceases to be subject to Stupidity the moment the character leaves the unit.

Units test for Stupidity in each of their Start of Turn sub-phases unless they are engaged in combat. By extension, a unit that fails a Stupidity test remains Stupid only until it passes a subsequent test.

Because models with this special rule delight in running down cowards who flee before a charge!

They should continue moving in the general direction they moved the previous turn or, if they did not move in the previous turn, towards the nearest enemy unit.

No. What's more, if the unit is formed, it will not be able to make a Vanguard rule. However, if the unit is in Skirmish formation, it can make its Vanguard move as normal, leaving the character behind.

No. When a character attempts to use a special rule that requires them to make a Leadership test, they must use their own Leadership characteristic and, unless specifically stated otherwise, cannot use any additional special rules they themselves do not have.