This Day in History – July 1, 2009

(The Daily News) Here is This Day in History for July 1, 2009. The Battle of Gettysburgh begins in 1863 and has the highest number of casualties irom the American Civil War. In 1946, the first peace time nuclear weapon's test takes place. On July 1, 1961, Princess Diana was born. Also, Hong Kong was returned to the rule of China and actor Marlon Brando dies.