What can a person learn about the bay of pigs incident

On April 17, 1961, 1400 Cuban exiles launched what became a botched invasion at the Bay of Pigs on the south coast of Cuba. In 1959, Fidel Castro came to power in an armed revolt that overthrew Cuban dictator Fulgencio Batista.

The Bay of Pigs invasion was a foreign policy embarrassment for the USA during the Kennedy administration. The invasion was carried out by Cuban exiles that had been trained by the United States' Central Intelligence Agency (CIA).  Within just three days in April, 1961, the force of exiles invading at the Bay of Pigs was soundly defeated by the Cuban Revolutionary Armed Forces, commanded by Cuba's communist leader Fidel Castro.   The CIA-trained force of Cuban exiles sought to overthrow Castro's government. 

In the aftermath of the Bay of Pigs affair, Cuba requested that the USSR, as its communist sponsor, place missiles in Cuba to deter further US-sponsored action against the Castro regime.  That request, coupled with the fact of American missiles that were located in Europe, within striking distance of the USSR, prompted Nikita Khrushchev of the USSR to send the missiles to Cuba.  And that became the "Cuban Missile Crisis" of 1962. 

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a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.