The closest real life has come to that is to assemble siege engines (like trebuchet) on the battlefield before use. Actual turrets on an active battlefield? No

The closest real life has come to that is to assemble siege engines (like trebuchet) on the battlefield before use. Actual turrets on an active battlefield? Not against a modern military, but maybe something like this: https://mwi.usma.edu/wp-content/uploads/2016/11/Spencer234.jpg https://mwi.usma.edu/wp-content/uploads/2016/11/Spencer234.j...