Editing Mieszko II Lambert (section)

===Retaliatory expeditions===
Despite the treaty which secured peace between Poland and Germany, the Emperor soon armed a retaliatory expedition against Mieszko II. Conrad II's army arrived to Lusatia in the autumn of 1029 and began the siege of [[Bautzen]], but the German troops did not receive the promised support of the [[Lutici]] tribe and the expedition failed. Threatened by the Hungarians, the Emperor was forced to retreat.

Probably in this same year, the son of Oldřich, [[Bretislaus I, Duke of Bohemia|Bretislaus I]], attacked and took Moravia.<ref>In the historical literature, different dates for this conquest appear: '''1017''' (Norman Davies, Boże igrzysko, t. I, Wydawnictwo ZNAK, Kraków 1987, {{ISBN|8370060528}}), '''1019''' (this date is supported by virtually all of Czech historiography; as ''[[pars pro toto|partes pro toto]]'' can be named: {{cite book |last1= Krzemieńska|first1= Barbara|title= Břetislav I.: Čechy a střední Evropa v prvé polovině XI. století|trans-title= Bretislaus I: Bohemia and Central Europe in 1st Half of the 11th Century|edition= 2nd.|year= 1999|publisher= Garamond|location= Praha|language= cs|isbn= 8090176070|chapter= II. Dobytí Moravy|trans-chapter= II. Conquering of Moravia}} or {{cite book |last1= Wihoda|first1= Martin|title= Morava v době knížecí (906–1197)|trans-title= Moravia in the Ducal Era (906–1197)|year= 2010|publisher= NLN|location= Praha|language= cs|isbn= 978-8071065630}}), '''1020''' (Tadeusz Manteuffel, ''Trudności wzrostu w Zarys historii Polski pod redakcją Janusza Tazbira, Polski Instytut Wydawniczy'', Warszaw 1980, p. 24), '''1021''', '''1029''' (G. Labuda, ''Korona i infuła'', Krajowa Agencja Wydawnicza, Kraków 1996, {{ISBN|8303036599}}, p. 1) and '''1030'''.</ref>

In 1030, Mieszko II secured an alliance with Hungary and once again invaded [[Saxony]]. In the meanwhile, his southern ally attacked [[Bavaria]] and temporarily occupied [[Vienna]].

In response, the Emperor organized another expedition against the Polish king, this time by organizing a coalition against Mieszko II. Already in 1030, [[Yaroslav I the Wise]] began the offensive and conquered Red Ruthenia and some [[Bełz]] castles.

In 1031, the Emperor concluded a peace with the [[Kingdom of Hungary]]. Probably in exchange for [[Stephen I of Hungary|Stephen I]]'s support, Conrad II ceded to Hungary the territories between the [[Leitha]] and Fischa Rivers. Now that the Emperor was less concerned about an attack from the south, in the autumn of 1031, he went on the offensive against Poland and besieged Milsko. The offensive ended with a complete success, and Mieszko II was forced to surrender some lands. As a result, the Polish King lost portions of the lands taken by his father, who warred often against Emperor Henry II.<ref>[https://www.britannica.com/biography/Mieszko-II-Lambert. Britannica, The Editors of Encyclopaedia. "Mieszko II Lambert". ''Encyclopedia Britannica'']</ref>