Unfortunately, such maneuvering was both time consuming and potentially difficult to arrange, so to provide some facility for a "snap shot" at high crossing angles, autocannons were hastily added to those fighters that lacked them.
Unfortunately, such maneuvering was both time consuming and potentially difficult to arrange, and in combat there were many situations where a target would cross in front of the fighter in a "snap shot". To provide some capability in these situations, autocannons were hastily added to those fighters that lacked them.