Maria Theresa having answered No, it is likely the Austrians will try to get across: Be vigilant therefore, ye mounted sentries.

Or will they perhaps make an attempt on Prag?
Einsiedel, who has no garrison of the least adequacy, apprises us That "in all the villages round Prag people are busy making ladders,"-- what can that mean?
Friedrich has learned, by intercepted letters, that something great is to be done on Wednesday, 18th: he sends Rothenburg with reinforcement to Einsiedel, lest a scalade of Prag should be on the cards.

Rothenburg is right welcome in the lines of Prag, though with reinforcement still ineffectual; but it is not Prag that is meant, nor is Wednesday the day.

Through Wednesday, Friedrich, all eye and ear, could observe nothing: much marching to and fro on the Austrian side of the River; but apparently it comes to nothing?
The mounted patrols had better be vigilant, however.
On the morrow, 5 A.M., what is this that is going on?
Audible booming of cannon, of musketry and battle, echoing through the woods, penetrates to Friedrich's quarters at Bohdenetz in the Pardubitz region: Attack upon Kolin, Nassau defending himself there?
Out swift scouts, and see! Many scouts gallop out; but none comes back.

Friedrich, for hours, has to remain uncertain; can only hope Nassau will defend himself.