Need Help Identifying Egypt Military Cover 1916 Censor 3147

Hello everyone
I am not as far as Military covers are concerned, they have loads of details and I have spent a good time trying to identify a couple of them but I have reached nothing .. This is the 2nd cover, mailed to Malta,1916 canceled, L.H .. DETAILS Field Post Office.
I don't understand what is the meaning of details before the Field Post office and what is L.H stands for as well. The cover also bears the censor seal serial 3147.
Can someone shed a bit of light on this cover ?

Many thanks
Amr

Possibly 1st Light Horse Brigade (Aussie regiment).