You need to wage war between society, i assume they are leaf cutters?, they are basically the only other species that are pinnacles of ant evolution in the sense that they have very large colonies, are highly socially sophisticated and have lots of divisions. So you need army ants, they will attack the mature colony, soldiers of both species will face and engage in an absolutely cataclysmic battle that will go on for days before the army ants should finally break through the defense. The leaf cutters have many soldiers, they produce very large ones at that, a soldier weighs hundreds of times what a worker weights. The soldiers really can’t do much work for the colony though, and this is what we exploit. They are massive, they are very expensive, and they are only for one purpose. The army ants have each other. Great numbers of the huge leaf-cutter soldiers – thousands of them – will be recruited to the front lines to try to defend against your army ants. I can guarantee you that eventually they are not going to be successful. The army ants always end up breaking through. if you cripple the army ants 30 to 1, and monitor them daily, picking them off with a nerf gun from the rear of the formation, for every 10 inches of space gain, find the mean of the rate of the invasion and use the area under that curve to figure out how many army ants you will need to start off with, so that when they finally win, they will be significantly weak enough that a couple of healthy bark scorpions should be able to finish them off. Let me know if you need a scorpion guy.