At around 9.45 AM, the advance guard of V Corps, consisting of the corps' ''Bataillon d'élite
(formed of the elite companies of battalions left at depots), the 17th Légère Regiment, and two cannons, made its way towards Saalfeld and occupied the heights overlooking the town. The French light cavalry brigade and the advanced guard began to engage the Prussian-Saxon army. The Bataillon d'élite'' supported by French skirmishers pushed out the Prussian troops from Garnsdorf and occupied it. As the French troops advanced and the Prussian-Saxon army prepared to fight them, Marshal Lannes noticed that the right flank of the Prussian-Saxon army was completely uncovered, and while the cavalry and French advanced guard engaged the Prussians around Garnsdorf and Saalfeld, he ordered rest of Suchet's division to march northwards through the woods to outflank the Prussian and Saxon line. To cover these moves, the 17th Légère Regiment formed a
skirmish line that extended from Saalfeld to Beulwitz. Prince Louis was aware that he was engaged with a larger force, and then at 11am, Saxon
Souslieutnant Heinrich August von Egidy brought a verbal order from Prince Hohenlohe to remain at Rudolstadt and that the offensive across the Saale had been abandoned. Prince Louis decided to try and disengage with the French and retreat to Rudolstadt. He ordered second battalion of the "
Müffling" Regiment to Schwarza to hold the bridges, and sent troops under the Saxon Generalmajor to extend the right of his line to the hills either side of (known as the Oberhayn and Sandberg). He also ordered the "
Prince Xaver" and "
Kurfürst" regiments to take the offensive by attacking the plain between Siechentbal and the Kesselthal streams. The skirmishers of the 17th Légère Regiment supported with the 34th
Ligne Regiment (which had moved out of the woods into Beulwitz) repelled the Saxon regiments, who then fell back in disorder. Prince Louis rallied these troops, and fearing that he would lose communication with General Bevilaqua and his troops, he ordered another attack, and by midday the "
Kurfürst" regiment had captured Crösten. Thinking that his centre was secure, Prince Louis gave further orders for a withdrawal. The French had entered Saalfeld and were pushing the Prussian troops back to , where Prince Louis headed to rally these troops. At just before 1pm, Marshal Lannes gave the signal for the offensive. The 34th, 40th, and 64th Ligne headed towards the Saxon troops around Aue am Berg, whilst the French cavalry, with the 88th Ligne behind them, moved forward between Crösten and Saalfeld. Prince Louis decided this was a moment to engage the French cavalry with the Prussian and Saxon cavalry, attacking an exposed flank of the 21st
Chasseurs à Cheval. However, the second line of French cavalry then enveloped the Prince's outnumbered cavalry line. Order in the Prussian and Saxon cavalry began to break down, and they fled joining the troops retreating from Saalfeld. In the confused mass around Wöhlsdorf, many were cut down by the French
hussars and some drowned trying to escape across the Saale. Prince Louis tried to cut his way out towards Schwarza, during which he was attacked by Quartermaster Guindet of the 10th Hussars. Although wounded, Prince Louis refused to surrender and was killed. Meanwhile, on the Prussian-Saxon right, General Bevilaqua tried to reinforce the Sandberg with the "
Prinz Clemens" regiment, but then seeing the rout at Wöhlsdorf, Bevilaqua ordered a retreat to Scwharza. As the first battalion of the "
Prince Clemens" Regiment moved down the slope it was attacked repeatedly by the 21st Chasseurs à Cheval, and the Saxons broke under the onslaught. the 21st Chasseurs à Cheval then assaulted and successively broke the second battalion "
Prinz Clemens" Regiment and first battalion "
Müffling" Regiment. As these troops dispersed, General Bevilaqua was captured. There was a final conflict at Schwarza and Pelet's force engaged the French around Unter-Wirbach. Pelet's force was largely intact but had to retreat to Stadt-Ilm, which it reached at 10pm. The French cavalry pursued the remains of the Prussian and Saxon units to Rudolstadt, but the French infantry halted at Schwarza. Some of the Prussian and Saxon troops that had escaped onto the east side of the Saale withdrew towards Rudolstadt. ==Aftermath==