He defended Alsace from the Germans, who had passed the Rhine, and invaded that province.

He obliged them first to raise the siege of Hagenau, then that of Saberne.

He eluded all their attempts to bring him to a battle.

And having dexterously prevented them from establishing themselves in Alsace, he forced them, notwithstanding their superiority of numbers, to repass the Rhine, and to take up winter quarters in their own country.
After the death of Turenne, a detachment of the German army was sent to the siege of Treves; an enterprise in which the imperialists, the Spaniards, the palatine, the duke of Lorraine, and many other princes, passionately concurred.

The project was well concerted, and executed with vigor.