[1.07 LoR] Allies from different war fighting against me

[Jay85]

A duke is fighting a defensive war against muslims (Holy war), his neighbors joined him in said war and attached their armies to his (I presume as they move as one).
I declare a war against the duke (no allies join him this time) but when I engage the army in a battle I am fighting the whole stack even though I am at war only with the duke.
See the attached screenshot for illustration.

 

[Sleight of Hand]

Is that not WAD, then? If those armies have attached themselves to his, would they not fight whoever he is?

 

[Jay85]

Is that not WAD, then? If those armies have attached themselves to his, would they not fight whoever he is?

That's the thing, I don't know. It's strange to me that I'm fighting someone I am not at war with.

 

[Dracko81]

They are his allies, attached to his army. If an army has attached units, those attached units are considered hostile to all the parent units enemies also.