If the French disregarded the neutrality of Belgium and Luxembourg, and advanced towards Cologne (or any other point on the Lower Rhine), the German army would be able to strike at their flank.
Pokud by Francouzi nerespektovali neutralitu Belgie a Lucemburska a zaútočili směrem na Kolín nad Rýnem (nebo kamkoli v jižním Porýní), německá armáda by mohla napadnout jejich křídlo.