The Battle of Hamel - 4th July 1918 - marked the first time Australian and American troops went into battle together. Four American companies (originally more, but some were sent elsewhere before the battle began) were incorporated into the Australian Corps under Lieutenant General John Monash.
Monash University in Australia (founded 1958) is named for Sir John Monash.
At a dinner of the ABCA (America Britain Canada Australia) Armies Cooperation Group at the Royal Artillery Mess in Larkhill, I offered a toast that included this event among others where our armies fought and bled together. New Zealand was includes as well as they are members, but in an adjunct status at the time due to political considerations.
I did not mention Brandywine, Lundy’s Lane, or New Orleans as they were not in keeping with the spirit of the occasion.