Castel dell'Ovo
Joanna entrusted her husband Otto of Brunswick with the few troops she could muster, but he was unable to stop the forces of Charles of Durazzo, who on 28 June 1381 crossed the borders of the Kingdom of Naples. After Otto's defeat at Anagni, and bypassing the Neapolitan defences at Aversa, Charles entered in Naples on 16 July at 7 p.m. and besieged Joanna in Castel Nuovo. Without any help, Joanna was forced to surrender on 25 August and was imprisoned, firstly in Castel dell'Ovo and later in the fortress of Nocera.