y commencing hostilities against the
Spaniards; and if this should lead to an open breach with the Emperor,
to maintain an army upon the German side of the Rhine, which was to act
in conjunction with the Swedes and Germans against Austria. For a war
with Spain, the Spaniards themselves soon afforded the desired pretext.
Making an inroad from the Netherlands, upon the city of Treves, they cut
in pieces the French garrison; and, in open violation of the law of
nations, made prisoner the Elector, who had placed himself under the
protection of France, and carried him into Flanders. When the Cardinal
Infante, as Viceroy of the Spanish Netherlands, refused satisfaction for
these injuries, and delayed to restore the prince to liberty, Richelieu,
after the old custom, formally proclaimed war at Brussels by a herald,
and the war was at once opened by three different armies in Milan, in
the Valteline, and in Flanders. The French minister was less anxious to
commence hostilities with the Emperor, which promised fewer advantages,
and threatened greater difficulties. A fourth army, however, was
detached across the Rhine into Germany, under the command of Cardinal
Lavalette, which was to act in conjunction with Duke Bernard, against
the Emperor, without a previous declaration of war.

A heavier blow for the Swedes, than even the defeat of Nordlingen, was
the reconciliation of the Elector of Saxony with the Emperor. After
many fruitless attempts both to bring about and to prevent it, it was at
last effected in 1634, at Pirna, and, the following year, reduced into a
formal treaty of peace, at Prague. The Elector of Saxony had always
viewed with jealousy the pretensions of the Swedes in Germany; and his
aversion to this foreign power, which now gave laws within the Empire,
had grown with every fresh requisition that Oxenstiern was obliged to
make upon the German states. This ill feeling was kept alive by the
Spanish court, who laboured earnestly to effect a peace between Saxony
and the Emperor. Wearied with the calamities of a long and destructive
contest, which had selected Saxony above all others for its theatre;
grieved by the miseries which both friend and foe inflicted upon his
subjects, and seduced by the tempting propositions of the House of
Austria, the Elector at last abandoned the common cause, and, caring
little for the fate of his confederates, or the liberties of Germany,
thought only of securing his own advantages, even at