Searching for: kind of warprize wangxian fic

Hello! I'm looking for a specific fanfic where the Jiangs (and Jins?) are at war with the Nies and Lans and eventually lose and WWX is kind of a warprize and ends up with LWJ.

I tried filtering for warprize and was unable to find it and haven't been able to come up with the right combination of filters. Things I remember are:

1. The Jiangs are not portrayed great in the story/war. The war happens because of some boundary dispute or something like that that WWX doesn't really approve of but leads their men bc he's loyal.
2. Eventually the Wens join the Nie/Lan side bc NMJ and Wen Xu have some kind of freak bonding moment about big brotherness or something. It's like wtf but also kind of cute.
3. WWX endears himself to the Nie/Lan side bc he calls a ceasefire for a flood and they work to evacuate and save civilians. He also makes sure any captured enemies are treated well and eventually saves Wen Ning from being tortured by JC.
4. The talisman designs used to help with the flood are one of the reasons given for asking for WWX after the war.

I have some very specific memories of it and apparently nothing helpful for finding it! It was a lot of stuff that felt unusual plus some of the usual tropes and I remember enjoying that about it. I also don't remember a lot about how the LWJ/WWX relationship develops so I wanted to revisit it. Please help, it's driving me crazy!