Kammala wannan jumla: Yakin sanyi, wanda aka fi sani da Arctic warfare ko yakin hunturu, ya ƙunshi ayyukan soja da dusar ƙanƙara, kankara, yanayin narkewa ko sanyi, a ƙasa da teku. Yanayin yanayin sanyi yana faruwa a duk shekara a babban tsawo ko a manyan latitudes, kuma a wasu wurare suna yin yanayi a lokacin hunturu. Yaƙe-yaƙe na tsaunuka sau da yawa ana yin su ne a yanayin sanyi ko kuma a wuraren da kankara da dusar ƙanƙara suka shafi, kamar Alps da Himalayas. A tarihi, yawancin irin waɗannan ayyukan sun kasance a lokacin hunturu a Arewacin Hemisphere. Wasu sun faru ne sama da Arctic Circle inda dusar ƙanƙara, kankara da sanyi na iya faruwa a duk shekara. A wasu lokutan, sanyi ko sakamakonsa sun kasance muhimmiyar mahimmanci a cikin rashin nasarar yakin basasa, kamar yadda Faransa ta mamaye Rasha a 1812, sojojin da suka yi yaƙi da Rasha a shekara ta 1812 sun yi yaƙi da Rasha a shekara ta 1812.
Soviet mamaye Finland a 1939, da mamayewar Jamus na Tarayyar Soviet a lokacin Yaƙin Duniya na II.