Declining ally joined war

[Dragonquack]

I DoWd on Castile, which was allied to Austria, when Austria had the little red x in the DoW screen and the tooltip said they would not join, and they declined the CtA. However, a month in, Austria randomly jumps in on their side, and no, it wasn’t Great Power intervention, since the GP amount was evenly matched, is this a bug?

 

[Cancerofthehead]

I DoWd on Castile, which was allied to Austria, when Austria had the little red x in the DoW screen and the tooltip said they would not join, and they declined the CtA. However, a month in, Austria randomly jumps in on their side, and no, it wasn’t Great Power intervention, since the GP amount was evenly matched, is this a bug?

This tends to be becuase Austria was not elligible to join the war, usually due to other wars they are in. Those other wars end they now get a CTA and join the war.

The other case I believe I have seen are if you cobelligerent someone,the cobelligerent’s CTA is some times after the war starts. Reasons for joining can change in that time.