Mondern but classic take on the life of a WW1 soldier

The wife of a former general in the German army received a letter in witch she was informed that her husband has to enlist in the German army and fight on the frontline. Affected by this news, she opposed the commanders who brought the letter, which shot her on the site. Her husband, in an act of revenge, starts being a hero on the frontline, violating orders and deciding the fate of the battle of Verdun.