Many new ideas and tactics were sparked by World War I that most of the world had never seen or experienced during a war before, this included espionage. Espionage was questionable to many people and countries before the war and in the early stages of the war, this was due to the fact that there were many different arguments on whether or not spies were beneficial to their countries' intelligence. Many accounts of espionage activity lead to executions, such as Mata Hari and Carl Hans Lody. After the execution of Lody at the tower of London, British government stated that his execution might not have been necessary because his work did not provide Germany with enough intelligence to hurt them. Espionage progessed from its questionable standing to countries realizing that if organized and executed properly espioange could be very benefial in the war effort.