 Nyorai mberi kweiyi ndima - Muhondo ya1806 yaipesana naNapoleon, Barclay akatora chikamu chakatanhamara muHondo yePultusk Zvita 1806 uye akakuvadzwa muHondo yeEylau7 February 1807, apo mufambiro wake wakamubatsira kukwidziridzwa kuva lieutenant general. Pashure penguva yokurapa, Barclay akadzokera kuhondo uye muna 1808 akatungamirira mabasa okurwisa vaSweden muHondo yeFinland. Muna 1809, akabudirira kufamba pamusoro peGulf yeBothnia yainge yaoma nechando, izvo zvakamubvumira kushamisika muvengi uye kutora Umeå muSweden. Nokuda kwechiito ichi, chakaitwa chisingafi nomunyori wenhetembo wokuRussia Baratynsky, akaitwa mukuru mukuru uye Gavhuna Mukuru weFinland. Gore rimwe gare gare, akava Gurukota reHondo, achichengeta nzvimbo yacho kusvikira muna 1813. 