He returned to service after Paul's death in 1801 and was appointed commander of the Fanagoria Grenadier Regiment on August 31 of that year. He participated in the War of the Third Coalition and fought in Langeron’s column at Austerlitz, where he was awarded the Order of St. Anna, 1st Class; a historian of the battle says "Kamensky-1's brigade over-achieved in a very difficult situation... [He] stands out for his rare example of initiative and effective intervention at a critical point in the battle." On June 27, 1806, he was promoted to lieutenant general and given command of the 12th Division. He joined the Army of Moldavia and participated in another Russo-Turkish War, in which he took part in actions at Brăila, Constanţa, Babadag, and Varna. In 1810, he served under his younger brother, General Nikolai Kamensky, and distinguished himself in the battle at Pazardzhik, for which he was promoted to general of infantry. He defeated the Turkish army at Shumla on August 4 and was awarded the Order of St. George (2nd Class). He commanded the Russian left wing in the battle of Batin in northern Bulgaria on September 7, 1810. In 1812, Kamensky commanded a corps in the army of General Alexander Tormasov and took part in the battles of Kobryn and Gorodechna. However, he had a falling-out with Tormasov and took a prolonged furlough late in the year.