Because you could just sit in your trench and wait for the opponent to attack, at which point you could shoot him, throw explosive devices, or even use chemical weapons that weren't banned then.
I would say all of the above except the last option. "Dirty conditions led to disease "
A boxing match featuring heavyweight champion, Jack Dempsey
Political cartoons and propaganda are very persuasive tools for sending a message or supporting an idea. You can use a cartoon to present imperialism in a humorous way and make the audience laugh while agreeing with the idea.
