If you force an enemy to attack through one of your powers, do they trigger an ally's
Combat Challenge fighter class feature ? ... assuming they were marked by the fighter
Yes they do.
Combat Challenge is an
If the enemy gets to target one of the fighter's allies, or is forced to target one of its own allies it makes no difference, it is making an attack that does not include your fighter and therefore is a mark violation and subject to combat challenge. Bonus: it also take the