Friedrich's first problem is the junction with Schwerin: junction not to be accomplished south of Ziscaberg in the present circumstances; and which Friedrich knows to be a ticklish operation, with those Austrians looking on from the high grounds there. Tuesday, 3d May, in the way of reconnoitring, and decisively on Wednesday, 4th, Friedrich is off northward, along the western heights of Lower Moldau, proper force following him, to seek a fit place for the pontoons, and get across in that northern quarter. "How dangerous that Schwerin is a day too late!" murmurs he; but hopes the Austrians will undertake nothing. Keith, with 30,000, he has left on the Weissenberg, to straiten Prag and the Austrian Garrison on that side: our wagon-trains arrive from Leitmeritz on that side, Elbe-boats bring them up to Leitmeritz; very indispensable to guard that side of Prag. Friedrich's fixed purpose also is to beat the Austrians, on the other side of it, and send them packing; but for that, there are steps needful! Up so far as Lissoley, the first day, Friedrich has found no fit place; but on the morrow, Thursday, 5th, farther up, at a place called Seltz, Friedrich finds his side of the Strath to be "a little higher than the other,"--proper, therefore, for cannonading the other, if need be;--and orders his pontoons to be built together there. He knows accurately of the Schwerin Column, of the comfortable Bevern Victory at Reichenberg, and how they have got the Jung-Bunzlau Magazine, and are across the Elbe, their bridges all secured, though with delay of one day; and do now wait only for the word,--for the three cannon-shot, in fact, which are to signify that Friedrich is actually crossing to their side of Lower Moldau. Friedrich's Bridge is speedily built (trained human hands can be no speedier), his batteries planted, his precautions taken: the three cannon-shot go off, audible to Schwerin; and Friedrich's troops stream speedily across, hardly a Pandour to meddle with them. Nay, before the passage was complete--what light-horse squadrons are these? Hussars, seen to be Seidlitz's (missioned by Schwerin), appear on the outskirts: a meeting worthy of three cheers, surely, after such a march on both sides! Friedrich lies on the eastern Hill-tops that night (Hamlet of Czimitz his Head-quarter, discoverable if you wish it, scarcely three miles north of Prag); and accurate appointment is made with Schwerin as to the meeting-place to-morrow morning. Meeting-place is to be the environs of Prossik Village, southeastward over yonder, short way north of the Prag-Konigsgratz Highway; and rather nearer Prag than we now are, in Czimitz here: time at Prossik to be 6 A.M. by the clock; and Winterfeld and Schwerin to come in person and speak with his Majesty. This is the program for Friday, May 6th, which proves to be so memorable a day.