While he may not be able to control other areas, this was his territory.
Lieutenant General Zhang Yunfeng was the commander of the seventh fleet. The main battlefield brought about tremendous pressure on his fleet, and at his busiest, he heard from his vice commander that Zhang Shan was acting on his own. He was furious - his orders were for them to defend, and prevent the enemy from attacking the main ship. Zhang Yunfeng knew about Zhang Shan's strength, hence he had told Zhang Shan to protect himself. Who knew that this kid would actually…
"Order him to come back, and ensure that all mech warriors follow the order to protect the main ship's safety."
Zhang Yunfeng was a conservative general. This battle is a war of attrition, it was not possible to overwhelm Maacah's coalition forces, so to live was the best course of action. If Meng Ao and the rest want to risk their lives, let them be.