The invisible - half faded, ghost - dogs can be a blessing .. if the pouches where yours ... Great general Quintus Julius unleashed from his thoughts the dogs of war to hunt down the last gaulish targs (maybe there are klingon wardogs ???) .. needles to say they did. A good day watching spirits killing your enemy while the rest of the army enjoys the show.

To bad it only happened 1 x in 2 years .. LoL
As for invisible enemy it happened when some of the unit where trapped behind the city wall, so i had to search for them, but they were there .. this happened 2 x and only when assaulting a city.