The Fourth War is a 1990 American cold war drama film directed by John Frankenheimer. It is set in West Germany of the late 1980s, and was filmed in Alberta, Canada. It stars Roy Scheider and Jürgen Prochnow as two military men whose personal dispute threatens to escalate into a larger conflict.

Plot

Colonel Jack Knowles is a tough, professional soldier who was decorated for gallantry in Vietnam. The same gung ho mentality that made Knowles a hero in wartime makes him a dangerous loose cannon in peacetime. He is stationed at an outpost on the West German-Czechoslovakia border and immediately gets into a dangerous personal war with his Soviet counterpart, Colonel Valachev. The two men ironically have many of the same characteristics. Knowles is enraged when he has to stand by as a Czech asylum seeker is shot on the border. Knowles immediately begins crossing the border on dangerous solo night missions to sabotage the enemy installations. Knowles comes into conflict with his by the book second-in-command Lieutenant Colonel Clark, and Knowles' superior, General Hackworth, angrily orders him to desist, but to no avail.