Both Group One and Group Three, while being part of East China, had always competed against each other as the army's two ace forces, and this situation had been escalating even before Ye Chen was around.
Where there are people, there's Jianghu, especially in such a vast place. In order to vie for limited resources, the competition between the two group armies had been particularly fierce. Adding to that, the discord between Chen Wei and Wang Jianjun from Group Three led to their troops competing even more unrestrainedly.
Fortunately, such a situation was kept under control within certain limits and didn't cause too much impact. Moreover, the strength of both armies was greatly enhanced, and other leaders were pleased to see this, opting not to interfere.