<prompt> Bhala okuqhubekayo kwalesi sigaba - UWilliam wayeyindodana endala kaHenry the Mild waseBrunswick emshadweni wakhe wokuqala noSophia, indodakazi kaWartislaw IV wasePomerania. Ngemva kokushona kukayise ngo-1416, wathola njengefa i-Brunswick Principality of Lüneburg ayeyibusa ngokuhlanganyela nomfowabo omncane u-Henry the Peaceful. UWilliam waba umbusi onamandla; ngokushesha wangena ezingxabanweni eziningi nezikhulu ezingomakhelwane ezifana noMbhishobhi Omkhulu waseBremen kanye noMbhishobhi waseHildesheim, futhi wasekela amaCounts aseSchauenburg naseHolstein empini yabo neNkosi u-Eric waseDenmark. Walwa noMargrave Frederick waseMeissen futhi wanqoba amaHussite  <response>: amabutho e-1421 eMpini yaseBrux. 