Dubislav Friedrich von Platen

In the Seven Years' War, Friedrich von Platen's regiment went to Saxony in 1756. On 4 March 1757, Platen received the Dragoon Regiment "Langermann" No. 8 as Inhaber (Proprietor) and was promoted to generalmajor. On 15 April 1757 he fought at Gross-Jägersdorf. After the battle, the regiment was transferred to Pomerania to defend it against the Swedes and fought there at the siege of Stralsund. At the beginning of 1758, the regiment was transferred to Farther Pomerania, where it was deployed until June against the Russians. He fought on 25 August at the Battle of Zorndorf, where two of his sons died. After the Russian retreat, the regiment drove back troops from such Russian-occupied Pomeranian towns as Gollnow and Greifenberg. He then moved north against the Swedes and his regiment occupied Prenzlau after the Battle of Pasewalk in December. On 17 January 1759, he took part in the capture of Demmin, after which he was again deployed against the Russians, this time in the Stolp area.[2]

Frederick II at the Battle of Zorndorf, where two of Platen's sons were killed.

On 12 May 1759, Platen was promoted to generalleutnant, and was given command of the cavalry in the army of Prince Henry, the King's brother, operating in Saxony. The prince sent Platen on a successful marauding expedition with Frederick William von Kleist to the Bamberg area; afterward, Platen joined the King's army for the Prussian loss at Kunersdorf. In May 1760, he was sent, with General Friedrich Wilhelm Quirin von Forcade de Biaix, to the Pomeranian Neumark, with instructions to halt the advance of General Gottlieb Heinrich Totleben and his Russian army into Prussia. Subsequently, Platen was ordered to Landsberg to block the approach of the Russians and Austrians into Silesia and, most importantly, to defend the city of Breslau. Despite his efforts, in October 1760, the Russians under command of Totleben and Ivan Chernyshyov, and the Austrian army commanded by Franz Moritz von Lacy, occupied Berlin.[2]

After the withdrawal of the Russians and Austrians from Berlin, Platen rejoined the King's main army and fought on 3 November at the Battle of Torgau. On 10 September 1761, he marched with the army to Poland to attack the Russian supply depots. He destroyed the Russian magazine in Köblin. On 15 September, he met a large Russian group of 5,000 wagons and 4,000 men near a monastery in Göstin. Joined by battalions from the Regiments "von Rothenburg", "von Arnim", "Görne" and "von Wunsch", he captured a large Russian magazine. From there, he proceeded to Posen, where he captured another magazine on 17 September.[2]

Meanwhile, the Russians had besieged Kolberg for the third time, and had thwarted all Prussian relief efforts. In an action at Landsberg, with the principal bridge over the Warta river destroyed, Platen's troops crossed the river with the help of pontoons and rafts. At Körlin, on 30 September, he was able to recapture from the Russians an intact bridge over the Parsęta river, taking 200 prisoners in the action. From there, he attempted to reach the besieged fortress by marching along the Parsęta shore. After a three-hour battle 8 kilometers (5 mi) southwest of Kolberg, though, the Russian forces commanded by Pyotr Rumyantsev stopped him at the village of Spie.[2] On 17 October, he tried to break through to Gollnow with 5,500 men to secure supplies from there, but the Russian general William Fermor stopped him in an artillery duel at the bridge over the Ihna. Ultimately, when he could not relieve the fortress, Kolberg had to capitulate on 16 December 1761 and its garrison entered into Russian captivity.[2]

In January 1762, Platen returned to Saxony to the army of Prince Henry's army, where his regiment was stationed at Pegau and Zeitz and had no part in the fighting of the year.[2]

In the War of Bavarian Succession, he commanded a corps in the army of Prince Heinrich, with whom he advanced on Prague, Peterswalde, Leitmeritz, and Budin an der Eger. In September 1786 he received from Frederick William II the Black Eagle Order. At the same time, the King appointed Platen as governor of Königsberg, an office which Platen did not want, but which he was persuaded to accept.[2]

On 20 May 1787 he became general of the cavalry and died shortly afterward on 7 June 1787. His name was perpetuated on the front of the Rheinsberg obelisk and on one of the honorary plates on the Equestrian statue of Frederick the Great established by Frederick's great great nephew, Frederick William IV of Prussia.[2]