SM UC-23
Date Name Nationality Tonnage Fate
29 November 1916 Minnewaska United Kingdom 14,317 Sunk
31 December 1916 Venus French Navy 281 Sunk
21 February 1917 HMS Princess Alberta Royal Navy 1,586 Sunk
10 June 1917 Kleopatra Greece 160 Sunk
13 June 1917 Aghios Nicolaos Greece 120 Sunk
14 June 1917 New Zealand Transport United Kingdom 4,481 Sunk
18 June 1917 Pannomitis Greece 11 Sunk
18 June 1917 Xiphias Greece 483 Sunk
19 June 1917 Jakobus Greece 304 Sunk
19 June 1917 Maria Greece 35 Sunk
19 June 1917 Raxiarchos Greece 30 Sunk
2 August 1917 HMS Ermine Royal Navy 1,777 Sunk
6 September 1917 HMT Helgian Royal Navy 220 Sunk
7 September 1917 HMT By George Royal Navy 225 Sunk
21 September 1917 Santo Nicola Kingdom of Italy 159 Sunk
21 September 1917 Spiridon Greece 128 Sunk
23 September 1917 Nicolaos Greece 104 Sunk
19 January 1918 Trocas United Kingdom 4,129 Sunk
23 January 1918 Birkhall United Kingdom 4,541 Sunk
24 January 1918 Aghia Arene Greece 16 Sunk
Summary of raiding history
SM UC-23 was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy () during World War I. The U-boat was ordered on 26 August 1915 and was launched on 29 February 1916. She was commissioned into the German Imperial Navy on 17 July 1916 as SM UC-23. In 17 patrols UC-23 was credited with sinking 45 ships, either by torpedo or by mines laid. UC-23 was surrendered at Sevastopol on 25 November 1918 and broken up at Bizerta in August 1921.