Guebriant left the Hessians to defend their conquests on the Lower Rhine
against Hatzfeldt, and advanced towards Thuringia, as if to second the
operations of Torstensohn in Saxony. But instead of joining the Swedes,
he soon hurried back to the Rhine and the Maine, from which he seemed to
think he had removed farther than was expedient. But being anticipated
in the Margraviate of Baden, by the Bavarians under Mercy and John de
Werth, he was obliged to wander about for several weeks, exposed,
without shelter, to the inclemency of the winter, and generally
encamping upon the snow, till he found a miserable refuge in Breisgau.
He at last took the field; and, in the next summer, by keeping the
Bavarian army employed in Suabia, prevented it from relieving
Thionville, which was besieged by Conde. But the superiority of the
enemy soon drove him back to Alsace, where he awaited a reinforcement.

The death of Cardinal Richelieu took place in November, 1642, and the
subsequent change in the throne and in the ministry, occasioned by the
death of Louis XIII., had for some time withdrawn the attention of
France from the German war, and was the cause of the inaction of its
troops in the field. But Mazarin, the inheritor, not only of
Richelieu's power, but also of his principles and his projects, followed
out with renewed zeal the plans of his predecessor, though the French
subject was destined to pay dearly enough for the political greatness of
his country. The main strength of its armies, which Richelieu had
employed against the Spaniards, was by Mazarin directed against the
Emperor; and the anxiety with which he carried on the war in Germany,
proved the sincerity of his opinion, that the German army was the right
arm of his king, and a wall of safety around France. Immediately upon
the surrender of Thionville, he sent a considerable reinforcement to
Field-Marshal Guebriant in Alsace; and to encourage the troops to bear