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.