following year (1636), a sudden inroad into the Electorate of
Saxony, where he gratified his inveterate hatred of the Saxons by the
most destructive ravages. Irritated by the memory of old grievances
which, during their common campaigns, he and the Swedes had suffered
from the haughtiness of the Saxons, and now exasperated to the utmost by
the late defection of the Elector, they wreaked upon the unfortunate
inhabitants all their rancour. Against Austria and Bavaria, the Swedish
soldier had fought from a sense, as it were, of duty; but against the
Saxons, they contended with all the energy of private animosity and
personal revenge, detesting them as deserters and traitors; for the
hatred of former friends is of all the most fierce and irreconcileable.
The powerful diversion made by the Duke of Weimar, and the Landgrave of
Hesse, upon the Rhine and in Westphalia, prevented the Emperor from
affording the necessary assistance to Saxony, and left the whole
Electorate exposed to the destructive ravages of Banner's army.

At length, the Elector, having formed a junction with the Imperial
General Hatzfeld, advanced against Magdeburg, which Banner in vain
hastened to relieve. The united army of the Imperialists and the Saxons
now spread itself over Brandenburg, wrested several places from the
Swedes, and almost drove them to the Baltic. But, contrary to all
expectation, Banner, who had been given up as lost, attacked the allies,
on the 24th of September, 1636, at Wittstock, where a bloody battle took
place. The onset was terrific; and the whole force of the enemy was
directed against the right wing of the Swedes, which was led by Banner
in person. The contest was long maintained with equal animosity and
obstinacy on both sides. There was not a squadron among the Swedes,
which did not return ten times to the charge, to be as often repulsed;
when at last, Banner was obliged to retire before the superior numbers
of the enemy. His left wing sustained the combat until night, and the
second line of the Swedes, which had not as yet been engaged, was
prepared to renew it the next morning. But the Elector did not wait for
a second attack. His army was exhausted by the efforts of the preceding
day; and, as the drivers had fled with the horses, his artillery was
unserviceable. He accordingly retreated in the night, with Count
Hatzfeld, and relinquished the ground to the Swedes. About 5000 of the
allies fell upon the field, exclusive of thos