"Tent Group outside waggons at Oasis".

"Tent pitching Showing Heliopolis.  Col Hardie, Capt Johnson, Cpl Reid, Pvte Inglis & myself."

"Myself" is Gordon Williams, whose regimental number was 3355.  Pte Inglis was No 3410 Thomas Inglis, a station hand from Orange, NSW.  You won't recognise him from the back view, but perhaps he is in one of the other photos in this post.