I found this on a WW1 slang site, but cannot find a poem or mnemonic for it.
"ARCHIE-Enemy antiaircraft shells bursting in the air - Supposed to be a derivative of Archibald a part in a popular comedy whose remark was not to-day Archibald and at one time a pilot is said to have made the same remark to shells bursting very near his machine.
See also ‘Black Archie’, ‘White Archie’."
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