of the duke's death, to take possession of his conquests, and to secure
his troops. These intrigues were no secret to the duke, and the
precautions he took in the conquered places, clearly bespoke the
distrust of France. But this misunderstanding with the French court had
the most prejudicial influence upon his future operations. The
preparations he was obliged to make, in order to secure his conquests
against an attack on the side of France, compelled him to divide his
military strength, while the stoppage of his subsidies delayed his
appearance in the field. It had been his intention to cross the Rhine,
to support the Swedes, and to act against the Emperor and Bavaria on the
banks of the Danube. He had already communicated his plan of operations
to Banner, who was about to carry the war into the Austrian territories,
and had promised to relieve him so, when a sudden death cut short his
heroic career, in the 36th year of his age, at Neuburgh upon the Rhine
(in July, 1639).

He died of a pestilential disorder, which, in the course of two days,
had carried off nearly 400 men in his camp. The black spots which
appeared upon his body, his own dying expressions, and the advantages
which France was likely to reap from his sudden decease, gave rise to a
suspicion that he had been removed by poison--a suspicion sufficiently
refuted by the symptoms of his disorder. In him, the allies lost their
greatest general after Gustavus Adolphus, France a formidable competitor
for Alsace, and the Emperor his most dangerous enemy. Trained to the
duties of a soldier and a general in the school of Gustavus Adolphus, he
successfully imitated his eminent model, and wanted only a longer life
to equal, if not to surpass it. With the bravery of the soldier, he
united the calm and cool penetration of the general and the persevering
fortitude of the man, with the daring resolution of youth; with the wild
ardour of the warrior, the sober dignity of the prince, the moderation