This historical Australian newspaper article contains the keyword "air raid": 19 Sep 1918, "The Sectarian Wave":
http://nla.gov.au/nla.news-article154659248
The Sectarian Wave - Tribune (Melbourne, Vic. : 1914 - 1918) - 19 Sep 1918
That an anti-Catholic agitation is rampant throughout the Empire at the present time is undoubted. In Australia we have ample demonstrations ...
Trove Air Raid Bot