Once the Franco-Italian army arrived near Verona it gathered reinforcements. Eugène also reorganized his army, assigning Generals of Division Jacques MacDonald, Paul Grenier, and Louis Baraguey d'Hilliers to command his infantry corps, and General of Division Emmanuel Grouchy to lead his cavalry. Baraguey d'Hilliers halted Chasteler's drive in the upper Adige valley. Because Archduke John sent a division to blockade Venice, his army arrived on the Adige with only about 30,000 troops, much fewer than Eugène. Napoleon's victory in the Battle of Eckmühl and the subsequent retreat of Archduke Charles, caused Emperor Francis II to order John to fall back and defend Austria. Anticipating an Austrian withdrawal, Eugène created a Light Brigade consisting of three "voltiguer" battalions, a squadron of light cavalry, and two cannon. The "voltiguer" units were formed by taking the skirmisher companies from infantry battalions. Eugène placed this pursuit force under General of Brigade Armand Louis Debroc.