Trying to find movie

I’m trying to find a movie about brothers who grew up in a sort of desert area and one or both went to war but there was a code word they would always shout while stuck in a sand storm and the word they’d use to call out to each other I believe is the title of the film

I remember them being very close to their mother and possibly set in Australia? But definitely somewhere very dry

The Water Diviner (2014)?