Xiang Yu's slightest action could easily excite his subordinates because he was their "big brother" in their hearts. Before Xiang Yu, they felt they should stand, but Xiang Yu broke that rule.
In Xiang Yu's eyes, they were all his brothers, there was no need for such formality. Those formalities were reserved for outsiders.
"Bro Yu, did you call us here because there's something up?" Jiang Chao asked.
Xiang Yu nodded and then briefly outlined the plan for the day. Upon hearing that there was a mission tonight, everyone got a bit excited. Especially since they were going with Xiang Yu, fighting side by side, which was a sign of Xiang Yu's trust in them.
"Ten minutes to get ready, then meet back here," Xiang Yu said.
They all acknowledged and went their separate ways to prepare. There wasn't really much to prepare, just checking their gear to make sure they had everything. If not, they would quickly get Tie Zhuzi to replenish their supplies.