On the 19th the heads of the Prussian armies were within less than two days’ march of the Austrian capital, but part of the Prussian forces were as far back as Brünn. Von Moltke did not know, to a certainty, how much of Von Benedek’s army had been brought back from Olmütz before the obstruction of the railway. A large part of it might already be in his front; he knew that large bodies of troops had come in from Italy; the fortifications of Florisdorf were extensive; and it seemed possible that the Austrians might, by a last great effort, have assembled an army large enough to enable them to push forward from Florisdorf, to deliver battle on the Marchfeld for the defense of their capital. With the double object of preparing to attack and being in readiness to receive an attack, Von Moltke ordered the Army of the Elbe to Wolkersdorf, the First Army to Wagram, and the Second Army in reserve at Schönkirchen. The Prussian army was thus concentrated behind the Russbach, in position to meet an attack of 150,000 Austrians from Florisdorf; to reconnoiter and attack the Florisdorf entrenchments; or to leave a corps of observation in front of them and push to the left and seize Pressburg. The Second Army, with the exception of the Vth Corps, was to be in position to support the other two by the 21st. The Vth Corps was to be hurried up as rapidly as possible, in order that the entire army might be concentrated for a decisive battle. The only troops of Von Benedek’s army which had reached Vienna by the 20th were the Xth and IIId Corps, part of the Saxons, and four cavalry divisions, numbering altogether from 55,000 to 60,000 men. The reinforcements from Italy which had arrived at the capital numbered about 50,000 men. Although the occupation of Pressburg was absolutely necessary to secure the prompt junction of the divided Austrian armies, that important point was held by only a single brigade. As soon as the Austrian IId Corps had reached Tyrnau, its leading brigade was pushed forward rapidly, in country carts, to reinforce the brigade at Pressburg, and the rest of the corps hastened towards the same place by forced marches. If Pressburg fell into the hands of the Prussians, the force still with Von Benedek, constituting the bulk of his army, would not be able to reach Vienna, and form a junction with the Archduke Albrecht, except by making a long detour _via_ Komorn, and would probably be delayed so long as to be helpless to prevent the capture of the capital.