The Chromeskulls and The Unimata formerly had semi-positive relations, to which the Unimata gave some seasonal clothing in exchange for the Chromeskulls to stay out of the ALMA conflict. However, as of recent that deal has shifted drastically. The Chromeskulls planned a surprise assault on a small group of Unimatans, capturing three of their lower ranks, and one of their Higher ranking individuals.
These POWs' were sent to the square to abide by their time until the next piece of the puzzle came into play. The Unimata had reached out to regain these lost soldiers, and as such the Chromeskulls came to meet them face to face. As every discussion goes, it delve into chaos, with both sides erupting into gunfire, and the eventual loss of the POW's through other means, although the Chromeskulls did lose their POW's, they drove Unimata back to their land, and out of the city.
The last part of the now-open conflict, came with the Chromeskulls sending in a final message, they arrived at the Mudlands armed and ready to deal with a simple shack, burning it to the ground as they fought a small group of Unimata forces. These troopers were injured in the ongoing fight, but eventually they were all able to return back to the Square, even after all that had went down.
After this final part, the Unimata and the Chromeskulls have deemed this to be an Open Conflict, sparking Unimata-Chromeskulls War.