What are some weapons that were used once but never again?

During the Civil War, a double barreled cannon was developed to fire two cannon balls simultaneously connected by a chain. The idea was to cut down the enemy with the chain. read more

Listed below are 5 weapons that were first used during World War I. Poison Gas Even though poison and poisoned weapons were banned by the Hague Declaration of 1899 and the Hague Convention of 1907, poison gas was used by all belligerents of World War I. read more

Nuclear weapons. On August 6 and 9, 1945, the first and so far the only atomic bombs used in warfare were dropped to two Japanse cities Hiroshima and Nagasaki, killing some 120,000 soldiers and civilians outright, and at least as many died of sickness and injuries during the next 5 years. Japan surrendered short after that. read more