An interesting question about network protocols

The two blues are located on two face-to-face mountains and are preparing to attack the Red Army in the valley. The Red Army can beat any Blue Army, but if the two Blue Army troops launch an attack at the same time, the Red Army will not be able to resist. The Blue Army communicates with each other through an unreliable communication system (one infantry ). A Blue Army Commander hopes to launch an attack at noon. He had a problem: If he sent an attack command to another blue army, he could not be sure the command would be received by the other party. If he asks for confirmation of the command, the confirmation may fail. Is there any agreement that can win two blues?

What do you think about this guy? Can you tell me? I haven't figured it out yet ~~~