Kammala jumla mai zuwa: Rundunar sojan ruwa ta Royal Navy ta yi asara mai yawa a cikin shekaru biyu na farko na yakin, ciki har da masu jigilar HMS, da kuma, da jiragen ruwa da kuma jirgin ruwa a cikin Turai, da kuma mai ɗaukar, jirgin ruwa, jirgin ruwa da jirgin ruwa mai nauyi, da kuma a cikin wasan kwaikwayo na Asiya. Daga cikin mutane 1,418 da suke cikin jirgin "Hood", uku ne kawai suka tsira daga nutsewar jirgin. Fiye da mutane 3,000 suka rasa rayukansu lokacin da aka canza jirgin ruwan soja a watan Yunin 1940, mafi girman bala'in teku a tarihin Burtaniya. Duk da haka akwai kuma nasarorin da aka samu a kan jiragen ruwa na abokan gaba, kamar yadda yake a cikin yakin River Plate a 1939, Narvik a 1940 da
Cape Matapan a 1941, da kuma nutsewar manyan jiragen ruwa na Jamus a 1941 da kuma a 1943.