WW1 German march 1916 dated postcard

A very nice WW1 German postcard that shows 2 flags and the text (roughly translated) “In battle joined, in fears class of nations, in solid duty. By this way the victory can be reached!”

On the back the card is written.
Hard to read and translate, because it is written in old style German.
Card is posted in Belgium and is dated with the date stamp 7 march 1916.