Jean-Baptiste d'Autriche
After abandoning Regensburg, Archduke Charles first retreated to Cham on the border of Bohemia where he reorganized his army. From there he marched for České Budějovice (Budweis). Fearing Napoleon might follow him into Bohemia, Charles wrote to Archduke John of Austria on 3 May that he planned to fight at Budweis. As late as 6 May, the main army remained in the vicinity of that city. However, detachments under Feldmarschall-Leutnant Johann von Klenau and General-Major Karl Wilhelm von Stutterheim operated closer to Linz on the north side of the Danube.