A unit can make its move freely as long as it stays 1" away from all enemies during its entire move.

The rules for charging on page 18 state: 'When you declare a charge you must do so without measuring the distance to the target, you must rely on your estimate of the distance to ensure that your troops can reach their target'. Emphasis on the 'ensure'. Therefore, declaring a charge that you know cannot be completed (like charging a unit 24" away) is cheating.

In cases where it's not obvious how far away a target unit is, the decision to charge or not is left to the conscience of the charging player (see also the 'Awkward charges' appendix). Our players, which are of course all sportsmen, will never declare a charge if they think their unit cannot complete the charge in order to gain an unfair advantage!

A very interesting question, and not an easy one to answer! Yes, we think it's acceptable to declare a charge in this kind of situations, and if the condition does not allow the unit to complete the charge (the friendly unit in the way does rally, in the example above), the charge fails.

No, you may charge the flank/rear of an enemy only if you are in that enemy's flank/rear zone. Therefore the unit in the example above must move until it is in the enemy unit's flank zone before it can charge its flank.

If the movement of the Compulsory moving unit is found to be in range (i.e. it's a valid charge!), and the charged unit flees, the fleeing movement is resolved immediately, and finally the compulsory move of the charger is resolved.

They must obey the normal rules, and so if they would hit a side of the enemy that they cannot charge, they must stop 1" away from the enemy.

No, it cannot move further that turn, as the compulsory moves part of the Movement phase has already passed.

This is never clearly specified, but we think it is best if they remain facing the direction they moved in. This not only looks and feels 'right', but also remains in line with the way fleeing units move (they are, after all, by far the most common type of unit subject to compulsory movement).

All charging units (including chariots, monsters, etc.): 1) Must try and bring as many models into the combat as possible, and 2) can wheel (or pivot) only once during the charge move.

The Failed Charge rules on page 21 state that a unit may fail a charge because 'the enemy has fled out of reach, or if you have estimated your charge incorrectly'. This includes situations when a unit declares a charge and then finds out that the charge cannot be completed for reasons other than enemy in the way (e.g. not enough space to squeeze through terrain, friendly units blocking the way, and so on). In such cases, the charge is failed, and the charging unit must stop in contact with the friendly unit or impassable terrain blocking its way,, or inside the difficult terrain slowing it down, etc. Note that the charge reaction declared by the enemy still stands.

As the charging unit has declared a new charge, it will have to go after the latest unit it has charged (B in the example above).

Yes, as this represents the unit spotting a new target as it thunders towards the fleeing enemies.

Yes, and this process will continue until the situation comes to either a successful charge or a failed charge. Note that units that are charged again through this process do not get a new charge reaction, which may sometimes mean that when the charging unit will finally move its full charge distance, it may destroy several units that fled from its charge.

Yes they can, so long as doing so doesn't reduce the number of models engaged.

Yes, as normally they are the same creatures that are slowed down by barding when ridden by other models in that army.

Simple! First Turn the front rank 90 degrees towards the intended direction, rotating the model(s) in the centre of the front rank around their centre. Then do the same with the rear ranks and move them back into contact with the first rank. Because the models aren't on square bases, this turn will result in the formation changing shape slightly.

Yes, they are, as the limit only specifically applies to the Reform manoeuvre.

Yes, this is fine.