What techniques did the u. s. navy employ to halt the destructive forces of the german submarines?

Unrestricted submarine warfare was first introduced in World War I in early 1915 ... those from neutral countries, would be attacked by the German navy. ... The incident prompted U.S. President Woodrow Wilson to send a ... government demanding an end to German attacks against unarmed merchant ships.

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.

sumerians were responsible.