What is Operation Precept in It: Welcome to Derry, and is it based on anything in the book?

Following episode 1's dramatic rug-pull, It: Welcome to Derry episode 2 hits the ground running as it introduces us to the ...
HistoryExtra

It was Operation Unthinkable: Churchill's "impossible" plan to start World War 3

In 1945, as Europe celebrated peace, Winston Churchill quietly asked his generals to plan an attack on the Soviet Union. But ...