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Sonar and more escort warships
The German codes were easily being read.
There is no idiom "the tide turned over." There is a saying that "the tide turned," but it's not an idiom because you can figure out what it means by thinking. Tides "turn" when they shift from high tide to low tide - the currents either go toward the beach or away from it depending on what tide is coming up. People say "the tide turned" or "the tide will turn" to mean that situations in life are changing, just in the same way that the tides change.
When the Tide Turned - 1915 I was released on: USA: 25 June 1915
my wang
When the Tide Turned - 1915 II was released on: USA: 20 March 1915
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The tide turned in favor of the United States during the battle of midway
Stalingrad
Saratoga
it turned the tide of the pacific theater
Gettysburg