Mezue ahịrịokwu na-esonụ: Na 13 Ọktọba 1939, Campbell sonyeere Second Australian Imperial Force (AIF), ma nye ya nọmba ọrụ AIF VX21. E kenyere ya na mbụ na &lt;a href="2/1st%20Battalion%20%28Australia%29"&gt;2/1st Battalion&lt;/a&gt; dị ka onye isi, mana ọ ghọrọ onye isi ndị agha nke 16th Brigade n'otu ụbọchị ahụ. A họpụtara ya ka ọ bụrụ Companion of the Distinguished Service Order maka òkè o keere na
Agha nke Bardia. Nkwupụta ya kwuru sị: