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Germany expected that at the most a day or so would see Belgian resistance broken and the dash on Paris begun. It was not safe to start such a forward rush with Belgium unconquered.

Kelly Miller (1919). “Kelly Miller's History of the World War for Human Rights ...: Why America Entered the Conflict ...& a Thrilling Account of the Important Part Taken by the Negro in the Tragic Defeat of Germany ...”
Germany expected that at the most a day or so would see Belgian resistance broken and the dash on Paris begun. It was not safe to start such a forward rush with Belgium unconquered.