Erich Fellgiebel was a person who lived a long time ago in Germany. He was born in 1886 and died in 1944.
When Erich was a young man, he became interested in the army and wanted to be a soldier. He went to a special school for soldiers and eventually became an officer in the German Army.
During World War II, Erich was in charge of sending messages between different parts of the army. This was really important because it helped the army know what was happening in different places and make good decisions.
But Erich didn't just send regular messages. He was part of a special group of people who secretly tried to help Germany win the war. They tried to do this by sending secret messages that would tell the army how to win battles or where to attack next.
Unfortunately, Erich and his secret group were eventually caught by the enemy. They were accused of trying to do bad things and were put on trial. Erich was found guilty and was put to death because of what he did.
So, in summary, Erich Fellgiebel was a soldier in World War II who was also part of a secret group that tried to help Germany win the war by sending secret messages. But he was caught and punished.