 In 1029, he was appointed count in the Saxon Hassegau and the adjacent Gau Chutizi in the March of Merseburg.He sent his forces against the Polish king Mieszko II Lambert to reconquer the Polish-occupied territories, sealed by the 1033 Treaty of Merseburg.Herman also fought against the Thuringian count William III of Weimar, and quarrelled with Bishop Thietmar of Merseburg.