Only one US submarine sank in World War One.
52
52 US subs were lost in WWII.
German submarines sank an enormous amount of British and Commonwealth shipping in the Atlantic and for a time in 1916 food stocks in Britain were down to about six weeks' supply. German submarines aslo sank some neutral ships and by sinking American ships they brought the U.S. into the war.
they sank the cruise ship because the thought it was carying aminition.
During World War II, German submarines (U-boats) sank approximately 2,800 Allied ships, totaling around 14 million gross tons. Italian submarines contributed by sinking around 1,300 vessels, amounting to about 3 million gross tons. Together, these submarines played a significant role in disrupting Allied shipping and maritime operations throughout the war.
326
7
2,200,000 Soldiers 97 Warships 40 Submarines.
The British lost 76 submarines during WWII.
1, 200,000 Soldiers 30 Warships 11 Submarines.
Yes, many submarines were used in WW1 by most of the major combatants.
Why don't you just Google "World War 1 Submarines?"