Mezue ahịrịokwu na-esonụ: N'afọ 1815, e jikọtara ndị agha Russia na German na ndị agha Prussia na Clausewitz banyereghachi ọrụ Prussia dị ka onye isi. N'oge na-adịghị anya, a họpụtara ya ka ọ bụrụ onyeisi ndị ọrụ nke III Corps nke Johann von Thielmann. N'ọnọdụ ahụ, ọ rụrụ ọrụ na Agha nke Ligny na
Agha nke Wavre n'oge Mgbasa Ozi Waterloo na 1815. Ndị agha nke Napoleon duziri n'onwe ya meriri ndị Prussia na Ligny (ndịda Mont-Saint-Jean na obodo Waterloo) na 16 June 1815, mana ha lara azụ n'usoro. Ọdịda nke Napoleon n'ibibi ndị agha Prussia dugara na mmeri ya ụbọchị ole na ole ka e mesịrị na Agha nke Waterloo (18 June 1815), mgbe ndị agha Prussia rutere n'akụkụ aka nri ya n'ehihie ka ha kwado ndị agha Anglo-Dutch-Belgian na-agbanye n'ihu ya. Napoleon mere ka ndị agha ya kweta na uwe ndị ahụ na-acha ntụ ntụ bụ uwe ndị ọchịagha Grouchy na-eyi. Clausewitz's unit lụrụ ọgụ nke ukwuu na Wavre (18<unk>19 June 1815), na-egbochi nnukwu nkwado iru Napoleon na Waterloo. Mgbe agha ahụ gasịrị, Clausewitz jere ozi dị ka onye nduzi nke "Kriegsakademie", ebe ọ jere ozi ruo 1830. N'afọ ahụ, ọ laghachiri n'ọrụ agha. N'oge na-adịghị anya mgbe nke ahụ gasịrị, ọgba aghara ọchịchị dị iche iche e nwere na Europe na nsogbu e nwere na Poland yiri ka hà na-egosi na a ga-alụ agha ọzọ buru ibu na Europe. A họpụtara Clausewitz ka ọ bụrụ onye isi ndị agha nke ndị agha Prussia nwere ike ịhazi n'ọnọdụ mberede a, nke ezigara n'ókè Poland. Onyeisi ya, Gneisenau, nwụrụ n'ọrịa ọnyụnyụ (August 1831), Clausewitz wee buru ọrụ nke ndị agha Prussia iji wuo ụlọ mgbaba iji gbochie ntiwapụ nke ọrịa ọnyụnyụ (nke mbụ ọnyụnyụ pụtara na etiti Europe nke oge a, na-akpata oke egwu na kọntinent). Clausewitz n'onwe ya nwụrụ n'otu ọrịa ahụ n'oge na-adịghị anya mgbe nke ahụ gasịrị, na November 17, 1831.