Conversation so far:
bay of pigs was a failed attempt to overthrow who
The Bay of Pigs Invasion was an attempt to overthrow Fidel Castro.
when did the bay of pigs invasion take place
On April 17, 1961, 1,400 Cuban exiles launched what became a botched invasion at the Bay of Pigs on the south coast of Cuba

Question: how did the leader find out about the attack
Self-contained rewrite: how did fidel castro find out about the bay of pigs attack