the woods to his left might contain Austrians, Lannes slowed his march so he could scout the terrain to the east. Even so, his column arrived at Rohr before Thierry's infantry. Without Pfanzelter's detachment to warn him, the arrival of Lannes' column surprised Schustekh. The Austrian commander gamely threw four squadrons of hussars at Jacquinot's advance guard. Eventually, Jacquinot got his entire brigade into action and pressed the Austrian hussars back on the supporting battalion and one-third of Grenz infantry south of Rohr. At this time, Thierry's winded infantry appeared on the scene. With the help of Gudin's 17th Light Infantry and a battery of artillery, Jacquinot's chasseurs broke Thierry's foot soldiers and hounded them into the woods again. To take the pressure off the infantry, Schustekh charged again, just as Thierry's lost dragoons showed up. At first, the attack went well, but then the Austrian horsemen came up against a mass of cuirassiers. The result was a rout of the Habsburg cavalry, who rode through the ranks of their own foot soldiers. The French chasseurs and cuirassiers rode roughshod over the troops of Thierry and Mesko, cutting down the fugitives. Over 3,000 Austrians became prisoners, including Thierry, and four cannon were lost. The previous evening, Hiller's VI Armeekorps bivouacked at Mainburg. Though a road ran directly from Mainburg to Louis' left flank at Siegenburg, a distance of only 13 kilometers, Hiller elected to join his colleague by a roundabout march via Pfeffenhausen. Once he arrived, Hiller was authorized to take command of all three left wing corps. Hiller personally arrived in Siegenburg to confer with Archduke Louis around midday. Hearing troubling reports from the right flank, he sent Feldmarschall-Leutnant Karl von Vincent toward Rottenburg with the line brigades of Generals-Major Josef Hoffmeister and Nikolaus Weissenwolf, plus four squadrons of the Rosenberg Chevauxlegers Regiment # 6. Petre names the two line infantry brigade commanders. Archduke Louis posted Prince Reuss and General-Major Joseph Radetzky von Radetz with four battalions and 12 cavalry squadrons at Siegenburg. Bianchi held the east bank of the Abens opposite Biburg. Lieutenant-General Karl Philipp von Wrede probed at Siegenburg but his 2nd Bavarian Division was easily fended off by Radetzky and a battery of 12-pdr cannon. At this time, Louis heard that the French attacked Thierry, so he ordered Radetzky to send two battalions to the right flank and called up Kienmayer's command from Ludmannsdorf. Wrede moved