Berthold of Rheinfelden and his army lay siege to a castle near Ulm for two weeks, finally destroying it with ballistae and forcing the defenders to surrender.
Dux itaque illuc ingreditur, et post paululum obsesso illic in proximo quodam firmissimo castello, ad iniuriam Friderici predicti plus quam duas ebdomadas illum ibidem sibi pugna congressurum audax nimis et bellicosus prestolatus est, donec machinamentis balisticis que mangones theutonizant, totum diruit, expugnavit et incendit, castellanosque omnes sine qualibet conditione ad deditionem sibi coartavit.
Translation :
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Edition :
I. S. Robinson: Bertholds und Bernolds Chroniken (FSGA 14), Darmstadt, 20-277.