Similar to M21_(モニター)

Hawaii Maru

List of patrol vessels of the Ottoman steam navy#Selmân-ı Pâk

SMS Frankfurt

Japanese destroyer Matsu (1915)

HMS Royalist (1915)

List of monitors of the Royal Navy

M15-class monitor

Erebus-class monitor

Lord Clive-class monitor

Roberts-class monitor

HMS M15

HMS Abercrombie (F109)

Abercrombie-class monitor

HMS Erebus (I02)

HMS Glatton (1914)

HMS Gorgon (1914)

HMS Severn (1914)

HMS Terror (I03)

HMS Humber (1914)

HMS Marshal Ney

HMS Mersey (1914)

HMS Roberts (F40)