After America entered World War II in the wake of Pearl Harbour, there was a raft of Hollywood films dedicated to making the case for war in ways both subtle and not. The Ox-Bow Incident, for example, is a Western about the dangers of mob mentality and the terrible things that can happen when good men do nothing. It's a story that could have been told at any time, yet the context of when it was produced and released - not to mention the inclusion of a card asking viewers to buy War Bonds at the end - indicate how film-makers were using their art to support the national cause.