Friedrich Wilhelm was fighting, far south in Alsace, on Kaiser Leopold's side, in the Louis-Fourteenth War; that second one, which ended in the treaty of Nimwegen. Doing his best there,--when the Swedes, egged on by Louis XIV., made war upon him; crossed the Pomeranian marches, troop after troop, and invaded his Brandenburg Territory with a force which at length amounted to some 16,000 men. No help for the moment: Friedrich Wilhelm could not be spared from his post. The Swedes, who had at first professed well, gradually went into plunder, roving, harrying, at their own will; and a melancholy time they made of it for Friedrich Wilhelm and his People. Lucky if temporary harm were all the ill they were likely to do; lucky if--! He stood steady, however; in his solid manner, finishing the thing in hand first, since that was feasible. He then even retired into winter-quarters, to rest his men; and seemed to have left the Swedish 16,000 autocrats of the situation; who accordingly went storming about at a great rate. Not so, however; very far indeed from so. Having rested his men for certain months, Friedrich Wilhelm silently in the first days of June (1675) gets them under march again; marches, his Cavalry and he as first instalment, with best speed from Schweinfurt, [Stenzel, ii. 347.] which is on the river Main, to Magdeburg; a distance of two hundred miles. At Magdeburg, where he rests three days, waiting for the first handful of foot and a field-piece or two, he learns that the Swedes are in three parties wide asunder; the middle party of them within forty miles of him. Probably stronger, even this middle one, than his small body (of "six thousand Horse, twelve hundred Foot and three guns");--stronger, but capable perhaps of being surprised, of being cut in pieces, before the others can come up? Rathenau is the nearest skirt of this middle party: thither goes the Kurfurst, softly, swiftly, in the June night (16-17th June, 1675); gets into Rathenau, by brisk stratagem; tumbles out the Swedish Horse-regiment there, drives it back towards Fehrbellin.