"Barbed Wire" (https://skfb.ly/6SZux) by daftvid is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).

"Gewehr 98 (ww1)" (https://skfb.ly/o9vJT) by Janovich is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).

Canon shot:https://freesound.org/people/craigsmith/sounds/486026  

Explosion:https://freesound.org/people/qubodup/sounds/161342/