I'm well aware of the nature of, and reason for the ANZAC day commemorations. The irony was that an event that served to define New Zealand and Australia's national identities, is also one of British Empires greatest failures.
(Of course, that description is a little bit exaggerated: I'm sure reality was much fuzzier and messier. But that just proves the point that Gallipoli has become our national myth. It defines us now, even if it didn't really define us then.)