That is, when it is a bugle, different sound rhythms represent different commands. For example, when charging, blow the bugle, and when the troops gather, blow the bugle. Basically not now, but when they get up every morning, they still play the morning horn, but they usually play it with a horn instead of the previous horn.

The story of the film is that the superior agreed to blow the assembly number at a certain time to quit the battle, but it didn't blow in the end.