Turenne, however, determined to carry out one more enterprise before the winter set in, and to reinstate the Elector of Treves, who had been deprived of his dominions for twelve years, in consequence of his having entered into an alliance with France.

In order to effect this he marched in the first week in November with a small force of infantry and his cavalry to the Moselle, a distance of forty leagues.
He was joined by some of Enghien's troops from Metz, and on the 14th of November he invested Treves.

The Imperialists were unable to gather a force of sufficient strength to relieve the town, which was, therefore, after a short resistance, forced to capitulate.

The small garrisons from other towns in the elector's dominions were speedily driven out and the elector restored to his possessions, a result doubly gratifying, since his restoration produced a widespread effect among the German princes who had thrown in their lot with France, while the material advantage was no less, as it closed a door through which the Imperialists, when in sufficient force, could at any time pour their troops into France.

This brought the campaign of 1645 to a close.