 In early December, the French submarine ran aground off the Bojana River estuary due to bad navigation, and was sunk by the Austrian destroyer "Warasdiner".The cruiser "Helgoland" and three destroyers sortie against the Otranto Barrage from 5–22 December and performed reconnaissance off the Albanian coast and San Giovanni di Medua.They sank an Italian picket boat, three steamships loaded with ammunition and two armed schooners "en route" to Northern Albania.