Ever since the new patch, whenever I declare war on an opponent who is already at war, this new army "attachment" feature allows anybody allied with them in their other wars to march around with them. That's fine. Except for when those same allies, who are NOT also at war with me, contribute their troops to the battle.
I am Duchy of Salerno, I attack Duchy of Apulia looking to take the County of Benevento. Apulia is at war with the Sicilian Shieks. The Papacy and HRE are helping Appulia against the Shieks, but they do NOT have any indiciation anywhere of also aiding Apulia against me. However, when the battle between my 2,500 men and the army marching around with Apulia ensues (of which Apulia is only contributing 800 men) instead of being in a battle against 800 men, I'm in a guaranteed losing match against all 19,000 of Apulia's, the Pope's and the HRE's troops.
Again, the pope and HRE have NOT pledged to aid apulia against me, only against the shieks, but I still have to fight their troops because they're "attached" to Apulia's army.
This is infuriating and desperately needs to be fixed.