Fermor rose from Posen August 2d, almost three weeks ago; making daily for the Neumark and those unfortunate Oder Countries; nobody but Dohna to oppose him,--Dohna in the ratio of perhaps one against four. Dohna naturally laid hold of Frankfurt and the Oder Bridge, so that Fermor could not cross there; whereupon Fermor, as the next best thing, struck northward for the Warta (black Polish stream, last big branch of Oder); crossed this, at his ease, by Landsberg Bridge, August 10th [Tempelhof, ii. 216.] and after a day or two of readjustment in Landsberg, made for Custrin Country (his next head-quarter is at Gross Kamin); hoping in some accidental or miraculous way to cross Oder thereabouts, or even get hold of Custrin as a Place of Arms. If peradventure he can take Custrin without proper siege-artillery, in the Oczakow or Anti-Turk way? Fermor has been busy upon Custrin since August 15th;--in what fashion we partly heard, and will now, from authentic sources, see a little for ourselves. The Castle of Custrin, built by good Johann of Custrin, and "roofed with copper," in the Reformation times,--we know it from of old, and Friedrich has since had some knowledge of it. Custrin itself is a rugged little Town, with some moorland traffic, and is still a place of great military strength, the garrison of those parts. Its rough pavements, its heavy stone battlements and barriers, give it a guarled obstinate aspect,--stern enough place of exile for a Crown-Prince fallen into such disfavor with Papa! A rugged, compact, by no means handsome little Town, at the meeting of the Warta and the Oder; stands naturally among sedges, willows and drained mire, except that human industry is pleasantly busy upon it, and has long been. So that the neighborhood is populous beyond expectation; studded with rough cottages in white-wash; hamlets in a paved condition; and comfortable signs of labor victoriously wrestling with the wilderness. Custrin, an arsenal and garrison, begirt with two rivers, and with awful bulwarks, and bastions cased in stone,--"perhaps too high," say the learned,--is likely to be impregnable to Russian engineering on those terms. Here, with brevity, is the catastrophe of Custrin.