@keni I am not sure if I have a video in forum-section videos about st lou, but most likely someone else posted one. If you have trouble with mg – think arise made some time ago a great video how to kill them with different strategies
That was a few patches ago where they behaved differently. Currently in version 0.23f it is best to spot them from afar or run away/ hid fast when to close. Then just let your men fire at the gunner from beyond his engagement range. This may take a while but is absolutely safe.