
German cavalry soldiers are shown firing from a standing saddle position during maneuvers near Berlin in 1935. They were trained to “fire from the saddle” at that time.

The horses were trained like this to make them accustomed to loud noises and the sight of rifles so they wouldn’t panic when confronted with them on the battlefield. The term for this kind of training is “bomb-proofing”.
It is very doubtful whether this accomplished much as World War II saw the end of nearly all cavalry use.