Samuel Gaudie and the 5th Infantry Battalion landed at Gallipoli on day one. Gaudie remained there until he returned to Lemnos in October 1915 though the reason is not clear from the records. The troops were quite debilitated by exposure and disease by that time, and many were evacuated for a rest, or to recover from disease. Sam seems to have decided he liked it on Lemnos, and disappeared. He may have found someone to shelter him in the Greek village of Castro on the island, which would have been delightfully human after the horrors of Gallipoli. He probably just didn't want to return. It set a pattern for the next few years. You can read the story of Sam's misadventures, as told by Rod Martin.
I have created a number of local history projects for which you will find links on this blog. I am a community historian (ie, not paid) living in Essendon. The content of my Empire Called database (see the link to the PBWorks website) is the result of nearly 25 years' research. The Empire Called blog is a companion for the PBWorks website of the same name.
Time Travellers in Essendon and Flemington is set up in the same way, with a website and a blog to report additions to the website. The website is a vehicle to publish longer pieces of research that are too long for newsletters. It also includes various indexes I have worked on for many years, plus photos from various sources which I date and describe in greater detail. You may find something of use for your research.