There was feud as normal since their territories overlapped but so now they leave each other alone they aren't really at war. The Trevinos have the Marines as a bigger threat to them than the Old School Zetas. The "big" war in Tamulipas now in Tamulipas the state the Gulf Cartel and Cartel del Noreste are is between the captains or commadantes or remaining commadantes of the Metro faction of C.D.G or Gulf Cartel. The Cyclones the Reynosa faction of the Gulf Cartel and "bosses" of the rest of the cartel want to take over the Reynosa plaza(Metro faction) with the Escorpiones as a spear or main function to do so. I really have no much info because honestly I don't really follow the cartels or read on them. Just read news and view videos. I would of privide more info but I am getting over the cartels because I am more worried about more personal things like coding, gaming and so on.