The brother of Pavel &amp; Alexander Tuchkov, Nikolay first came to note as a Major General commanding a Brigade of Gortchakov's wing under Korsakov in Switzerland, 1799, serving at the Second Battle of Zurich 25–26 September. In 1806 he commanded the 5th Division of Buxhoeveden's 2nd Army under Mikhail Kamensky in Poland, and served at the Battle of Pultusk 26 December. In the January 1807 offensive he commanded three Divisions (5th, 7th &amp; 8th), and the right wing at Eylau 7/8 February 1807, where his troops were the first to be engaged. He was made commander on the Narew front that summer. On 11 June he drove Claparède from Drenzewo &amp; Borki, but was forced back by Andre Masséna on the 12th. After hearing news of the defeat at Friedland on the 27th he abandoned Ostrolenka &amp; retreated on Tykoczin, and was subsequently replaced by Tolstoi before the Treaty of Tilsit.