Yvonne - If you log on to the Australian War Memorial site - www.awm.gov.au - you can get your William's army number and then apply for his Personnel dossier on-line or by mail etc from www.naa.gov.au - his dossier should include copy of marriage cert and date of sailing home etc and whether she came with him or on a separate ship. If she came on a separate ship you should be able to get that using the info in the dossier and immigration on the same site. All the best, Alice.