As the saying went, "When you hold a position, you must fulfill its duties." Publicly speaking, although Orochimaru was no longer very interested in the war at this point, since he had been appointed the frontline commander, he still had to do the work that needed doing... Completely quelling the war between Konoha and Sunagakure was one of his most important responsibilities.
Privately speaking, first, only after the war ended could Orochimaru truly leave the front line and devote his limited life to the limitless study of ninjutsu. He no longer wanted to waste his time on meaningless things. Second, Orochimaru also wanted to do some private business under the cover of darkness in Sunagakure—or, more specifically, he wanted to "smuggle" some private goods out.
Based on the principle of acting quickly and decisively, Orochimaru planned to charge straight in while Sunagakure was still in chaos and catch them completely off guard. Naturally, the faster this operation went, the better. Thus, even with some support personnel included, the total number of Konoha troops participating in the operation did not exceed fifty, making preparations extremely quick... The Konoha frontline camp had always maintained a good level of combat readiness.
When Orochimaru was making his tactical arrangements, he did not ask the three of Yuhara to leave. Only after most of the details concerning the operation had been settled did he turn to them and say, "Of course, you'll be following this operation as well. If we discover that the Fourth Kazekage isn't dead when we reach Sunagakure, I'll have to hand you over to Sunagakure as criminals who failed to assassinate the Kazekage. Heh heh."
Yuhara: "..."
What the hell are you laughing about? Yet at a time like this, Yuhara and the others could only nod and agree.
To be