The following information is drawn from narrative sources and is intended to illuminate both the large number of military operations undertaken by Ottonian armies, and the predominance of siege operations as contrasted with battles in the field. However, it is to be emphasized that a great many military operations, particularly sieges, are not discussed in surviving narrative works, and can only now be known through the excavation of fortified sites.
919 The surrender of all of Duke Burchard of Swabia's urbes to Henry I.
921 Henry I's siege of Regensburg.
923 Siege and defence of the castrum of Saverne in the pagus of Alsace.
923 Defense of Worms against King Charles the Simple.
923 Henry I's siege of Metz.
c. 924 Defense of Püchen against the Hungarians.
925 Henry I's siege of the fortification (oppidum) at Zülpich.
926 Defense of Werla against the Hungarians.
928 Henry I's siege of Durofostum.
928-9 Henry I's capture of Brandenburg.
928-9 Henry I's capture of Jahna (Gana).
928-9 Siege of Lebusa.
929 Henry I's siege of Prague.
929 Defense of Walsleben against the Redarii.
930 Siege of Douai by Duke Gislebert of Lotharingia.
932 Siege of Péronne by Duke Gislebert of Lotharingia.
933 Defense of unnamed fortress in region of Merseburg.
935 Siege of St Quentin by Duke Gislebert of Lotharingia.
936 Otto I's siege of unnamed urbs hostium.
937 Defense of the fortress of Helmern by Bruning.
938 Defense of the fortress of Belecke.