1760 - Siege of Cosel

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The Fortress of Cosel (present-day Kędzierzyn-Koźle), one of the medium sized fortresses in Silesia, occupied an important position on the left bank of the Oder where the smaller Klodnitz River (present-day Kłodnica) flowed into it.

In March 1760, General Goltz sent an additional battalion of the Garrison Regiment V Jung Sydow to Cosel as reinforcement. He had taken this precaution because of Loudon's arrival in Silesia.

Loudon soon sent small detachments towards Cosel, Ratibor (present-day Raciborz), Leobschütz (present-day Głubczyce) and Neustadt (present-day Prudnik). On March 26, one of these detachments appeared in front of Cosel but soon retired to Kranowitz (present-day Krzanowice).

In July, Frederick II, ordered to execute all deserters without trial.

By mid-October, Loudon considered that the garrison of Breslau was too strong to hope for success in these quarters and decided to turn his attention towards the Fortress of Cosel on the Oder River. Accordingly, he marched to Reichenbach.

On October 15, Loudon’s Army marched to Frankenstein (present-day Zabkowice Slaskie).

October 17, Botta’s detachment made a junction with Loudon’s Army near Kamnig (present-day Gmina Kamiennik). There, he received a reinforcement of 3 bns and 1 cavalry rgt from Loudon and was instructed to lead this vanguard towards Cosel.

Heavy rain delayed the beginning of the siege.

On October 20, Loudon’s Army (20,000 men) marched in 2 columns from Oberglogau (present-day Głogówek) and reached Zülz (present-day Biała).

In the Fall, Loudon appeared in front of Cosel. He held a council of war where it was decided to lay siege to the fortress.

At this time, Christoph Fredrich von Lattorf was the commander of the fortress of Cosel which was defended by some 50 guns and 5 battalions (see detailed order of battle below).


Map of the Fortress of Cosel
Courtesy: Dinos Antoniadis


On October 21, Loudon’s Army appeared in front of Cosel, on the left bank of the Oder. It encamped on the hills between Reinschdorf (present-day Reńska Wieś), Wiegschütz (present-day Większyce) and Komorno on the left bank of the Oder. Loudon established his headquarters at Kranowitz (present-day Krzanowice) and left Colonel Faber with a detachment (Grün Loudon Grenadiers, 100 husssars) to Zülz to escort the heavy siege guns arriving from Olmütz (present-day Olomouc/CZ). However, due to long heavy rain, the surrounding of Cosel was not suitable for the deployment of heavy guns. Therefore, these guns remained at Klein Nimsdorf.

On October 22, the Austrians cut the communications of the fortress from the east and threw a pontoon bridge at Brzezetz (present-day Brzeźce). Troops manned the bridgehead on the right bank of the Oder.

On October 23, Loudon established another bridge at Rogau (present-day Koźle Rogi). Once these bridges ready, some units crossed the Oder to complete the encirclement of the fortress from the right bank. The Austrian cavalry was encamped at Reinschdorf and detachments were posted at Juliusburg (present-day Radziejowo) and Wiegschütz.

On October 23 and 24, the Austrians started to dig the first parallel and to erect earthwork to set up batteries for the siege artillery. They made 30,000 fascines.

In the evening of October 24, FZM Ferdinand Filip Count von Harsch arrived at Cosel. He had been sent by the Hofkriegsrat (War Council) in Vienna to support Loudon.

On October 25, additional Austrian Corps arrived under Joseph Count von Bethlen to reinforce Loudon. In the evening, Loudon launched an assault from the left bank of the Oder against the isolated redoubts of Kobelwitz, Rogau and Wiegschütz. The Prussian Major Johann Leopold von Arnswald distinguished himself during this combat. Finally, at 9:30 p.m., the fire of the Prussian artillery forced the Austrians to retreat. Loudon also tried another of his trick, sending catholic soldiers to Cosel to convince the garrison to surrender. Loudon promised pardon to all soldiers who would surrender. According to Lattorf's letter to the king, not a single soldier decided to abandon his post.

The same day (October 25), a Prussian relief force (22 bns, 36 sqns) under General von Goltz reached Glogau (present-day Głogów). Loudon was surprised to learn that such an important force was on its way to relieve Cosel. He was now impatient to capture the fortress before Goltz's arrival because he did not want to meet this Prussian force on the field. However, heavy rain made it almost impossible to make regular siege with parallels and trenches. Furthermore the Austrian siege artillery had insufficient ammunition.

On October 26, during a reconnaissance, Loudon came to the conclusion that it would take 5 to 6 days to remove the heavy guns from the trenches, if a retreat should become necessary (the Prussian Major-General Goltz was only 7 to 8 day's march form Cosel). Accordingly Loudon decided to raise the siege.

On the night of October 26 to 27, Loudon, after a preparatory bombardment with howitzers placed behind the dam of the Oder, launched a last general attack to storm the fortress, destroying some magazines and damaging the palisade and main wall. Grenzers, supported by grenadiers, tried to penetrate into the fortress but were repulsed. After this assault, the defenders repaired the most serious damages. During this combat, the Prussian Major Sebastian Friedrich von Braxein distinguished himself. Loudon then sent a messenger to summon the garrison but he received a negative answer.

On October 27, Loudon sent back the siege park.

On October 28, the Austrian main forces crossed the Oder River and withdrew.

On October 29, the Austrian main forces marched to Oberglogau, leaving only a detachment at Urbanowitz (present-day Urbanowice) to observe the garrison of Cosel. The heavy artillery was sent to Littau (present-day Litovel/Moravia). Bethlen’s Corps took position at Zülz.

On October 30, the rest of the Austrian units retreated, burning all fascines before leaving.

On November 1, a small detachment under Colonel Hieronymus Baron Ljubibratich von Trebinija (2 bns of Slavonisch-Gradiskaner Grenzer, 100 hussars), which had been previously sent to Urbanowitz to reconnoitre the region around this stronghold, was attacked by part of Lattorf's troops, who made a sortie and forced the detachment to retreat to Ratibor (present-day Racibórz).

Lattorf admitted that he had lost no more than 7 men wounded during the siege. Other sources mentions only 2 dead and wounded overall. Austrians losses are unknown.

On November 2, Loudon proceeded to Neustadt in Upper Silesia with his corps. Bethlen, who had remained until then at Zülz, was replaced by Jaquemin and moved into position between Loudon and Wolfersdorf near Weidenau.

Orders of battle

Austrian Army

Commander: Feldzeugmeister Baron Ernst Gideon Loudon


Engineers, miners and sappers


Detachment under Generalfeldwachtmeister Nauendorf

Prussian Army

In 1758, the fortress of Cosel was garrisoned as follows:


Officers of the Grosser Generalstab: Geschichte des Siebenjärigen Krieges in einer Reihe von Vorlesungen, mit Benutzung authentischer Quellen, Vol. 4 – Der Felzug von 1760, Berlin 1834, pp. 273-274

Kessel, E.: Das Ende des Siebenjährigen Krieges 1760-1763, 2007, Paderborn, pp. 60-61


Tomasz Karpiński from Gniezno/Poznań for the initial version of this article.

Harald Skala for the translation and integration of info from Kessel's work

Richard Couture for the translation and integration of info from the work of the Officers of the Grosser Generalstab