, ▁Pr uss ia ▁was ▁defeated ▁by ▁Napoleon ▁in ▁ 1 8 0 6 . ▁In ▁the ▁Tre aty ▁of ▁T ils it ▁the ▁following ▁year , ▁the ▁Duch y ▁of ▁Mag de burg ▁was ▁dissol ved . ▁The ▁du cal ▁territory ▁west ▁of ▁the ▁El be ▁River , ▁including ▁the ▁cities ▁Mag de burg ▁and ▁Halle , ▁were ▁made ▁part ▁of ▁the ▁Kingdom ▁of ▁West phal ia , ▁a ▁client ▁state ▁of ▁the ▁First ▁French ▁Empire . ▁The ▁du cal ▁territory ▁east ▁of ▁the ▁El be ▁remained ▁in ▁a ▁dr ast ically ▁reduced ▁Kingdom ▁of ▁Pr uss ia . ▁ ▁Pr uss ia ▁re ac quired ▁the ▁Mag de burg ▁and ▁Halle ▁territ ories ▁during ▁the ▁War ▁of ▁the ▁Six th ▁Co al ition . ▁In ▁ 1 8 1 5 ▁after ▁the ▁Napole onic ▁Wars , ▁the ▁territ ories ▁of ▁the ▁Duch y ▁of ▁Mag de burg , ▁the ▁Alt mark , ▁and ▁part ▁of ▁the ▁Kingdom ▁of ▁Sax ony ▁were ▁co ales ced ▁to ▁create ▁the ▁new ▁Pr uss ian ▁Province ▁of ▁Sax ony . ▁ ▁Notes ▁ ▁References ▁ ▁External ▁links ▁ ▁Map ▁of ▁the ▁Duch y ▁of ▁Mag de burg ▁in ▁ 1 7 8 9 ▁ ▁Category : St ates ▁and ▁territ ories ▁established ▁in ▁ 1 6 8 0 ▁Category : 1 6 8 0 ▁establish ments ▁in ▁Europe ▁Category : 1 8 0 7 ▁dis est ab lish ments ▁in ▁Pr uss ia ▁Duch y ▁Category : H alle ▁( Sa ale ) ▁Category :