Invasion of France.—In the west, though there were no such battles as Wittstock, the campaign of 1636 was one of the most remarkable of the whole war. The Cardinal Infante was not only relieved by the retreat of the Dutch, but also reinforced by a fresh army' under a famous cavalry officer, Johann von Weert. He prepared, therefore, to invade France from the north west. The French were too much scattered to offer an effective resistance, and the Cardinal Infante's generals took Corbie, passed the Somme and advanced on Compiegne. For a moment Paris was terror-stricken, but the Cardinal Infante missed his oppor tunity. Louis XIII. and Richelieu turned the Parisians from panic to enthusiasm. The burghers armed and drilled, money, too, was willingly given, and some 12,000 volunteers went to Compiegne, where all levies and reinforcements were concen trated. Thus the army at Compiegne was soon 5o,000 strong. It was only half mobile owing to its rawness and its "trained band" character, but the Spaniards and Bavarians retired un molested to oppose Frederick Henry in the Low Countries.
During the episode before Compiegne another storm burst on the eastern frontier of France. This was the inroad into Burgundy of Gallas with the main imperialist army. He took a few small towns, but Dijon and the entrenchments of Bernhard's army there defied him, and his offensive dwindled down to an attempt, soon abandoned, to establish his army in winter quarters in Burgundy.
berg. On the Low Countries frontier the cardinal de La Valette captured Cateau Cambresis, Landrecies and Maubeuge.
The main imperialist army, still under Gallas, had departed from Alsace to the east in order to repair the disaster of Wittstock, and Charles of Lorraine was defeated by Bernhard on the Saline in June, after which Bernhard advanced vigorously against Pic colomini, the imperialist commander in Alsace. But soon Piccolo mini was joined by Johann von Weert, and Bernhard retired again.
In the north-east the effect of Wittstock proved but transient. In 1638 Bailer found himself the target of several opponents. The Saxons did no more than defend their own country, but the imperialists and Bavarians uniting under Gen. Geleen manoeuvred Baner out of his strongholds on the Elbe. He retreated on the Oder, but there found, not the expected assistance of Wrangel's Pomeranian army, but Gallas with the main imperial army which had hurried over from the west. Baner escaped only by a strata gem. Deluding Gallas with an appearance of retreat into Poland, he slipped northwards, joined Wrangel, and established himself for a time in Pomerania. Gallas ruined his army by exposing it to an open winter in this desolate country, and at last retired to the Elbe.