Peter Lawford's part in the beginning of the movie was unusual in that he first seems to be an effeminate young fellow picking flowers rather than joining in with the manly deer hunt and then we find he has a lady in there with him, and not his lady. Conveniently, he says his sword arm is sliced to the bone, although it doesn't look all that bad, and he passes the duel on to his unfortunate kinsman who is later walled up by his father. When we learn that the entire family line was made up of cowards it puts a different complexion on everyone's actions and makes for an adult sort of kids' movie. (It seems that cowardice was either common in that region or the other party in the duel was some sort of relative, too.)
What we and O'Brien and Young's characters learn in this movie is that courage is mind over matter not genetics and that anyone old or young can be terrified but not everyone folds like a cheap card table, whether confronted by a ghost or the enemy. Young teaches it to O'Brien and she later has to remind him of it. That is good to keep in mind in any era but especially in wartime when frightening rumors could send people into hysterics rendering them not only useless but dangerous. If the poor ghost had, when alive, stood up to his relatives he could have avoided the dire events. Instead, he ended up cowering in a corner in shame and allowing himself to be bricked in. This story and the Wizard of Oz have a common theme--the way you perceive yourself alters your actions.
