The film is an action thriller set during World War Two, so violence and warfare are central themes.
Matrac (played by Bogart), a major character, is shown as heroic for bombing enemy cities. The danger inherent in these raids is clearly but not graphically shown.
A prisoner is shot in the back trying to escape, followed by an alligator approaching his body. What happens next is not shown.
Matrac's newspaper office is destroyed by a mob, and he fights backs with his fists.
During Matrac's imprisonment, the guards cruelly beat him. Two club hits are shown on-screen, followed by several blows shown only in shadows.
The prisoners on a ship at sea, along with other heroes, violently take it over. Fist fights, clubs, and shootings occur during the fight, with several deaths.
An enemy airplane attacks this ship with bombs and machine guns.
See "Intense Scenes" for what happens next.
Matrac is shot during a bombing raid, and dies from his wounds.