British - World War I - a signal that artillery was to begin.
"balloon-goes-up." YourDictionary, n.d. Web. 16 October 2018. <http://www.yourdictionary.com/balloon-goes-up>.
balloon-goes-up. (n.d.). Retrieved October 16th, 2018, from http://www.yourdictionary.com/balloon-goes-up
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