1806 - 1807
Yakin hadin gwiwa na hudu
Haɗin kai na huɗu ya yi yaƙi da Daular Faransa Napoleon kuma an ci nasara a yaƙin da ke tsakanin 1806-1807.Babban abokan haɗin gwiwar sun kasance Prussia da Rasha tare da Saxony, Sweden, da Burtaniya suma sun ba da gudummawa.Ban da Prussia, wasu membobin haɗin gwiwar sun yi yaƙi da Faransa a baya a matsayin wani ɓangare na haɗin gwiwa na uku , kuma babu wani lokaci na zaman lafiya na gaba ɗaya.A ranar 9 ga Oktoban 1806, Prussia ta shiga sabuwar sabuwar kawance, tana tsoron karuwar ikon Faransa bayan shan kayen da Ostiriya ta yi da kafa kungiyar Rhine da Faransa ke daukar nauyinta.Prussia da Rasha sun haɗu don sabon yaƙin neman zaɓe tare da yawan sojojin Prussia a Saxony.