Verdun was the site of the longest battle of WWI. Both sides pursued a 'war of attrition' during the First World War. This meant fighting for prolonged periods of time through a series of small-scale actions, in an attempt to gradually wear down the other side. This policy led to huge numbers of casualties, and Verdun was a prime example of this. You can visit some of the WWI battlefields and see some of the former trenches and shell holes that still exist. We recommend doing this with a private guide, who can explain the full context of what happened there.