[1] On his return to Europe he persuaded his brother to engage in a speculation for exporting glass to the United States, which proved a complete failure.
His hopes of military employment were again disappointed, and his brother, the future field marshal, who had stood by him in all his troubles, finally left him.
He was arrested as insane, but medical examination proved him sane and he was then lodged as a prisoner in Kolberg, where he was harshly treated, though August von Gneisenau obtained some mitigation of his condition.
According to the Encyclopædia Britannica Eleventh Edition: In Bülow's writings there is a distinct contrast evident between the spirit of his strategical and that of his tactical ideas.
He was the first to recognize that the conditions of swift and decisive war brought about by the French Revolution involved wholly new tactics, and much of his teaching had a profound influence on European warfare of the 19th century.
We must organize disorder, he said; indeed, every argument of writers of the modern extended order school is to be found mutatis mutandis in Bülow, whose system acquired great prominence in view of the mechanical improvements in armament.