The first entry seems unambiguously 29/12/1915 - Movement to Noeux les Mines. The second entry seems to have a date range of 29/12/1915 to 11/12/1915 - I am not at all sure what to do with this other than leave out the second date in the range. The next entry is for 2/1/1916. It almost looks like he put 11 in place of 31/12/1915. Unless I hear otherwise I will leave off the second date in the range.
by cyngast moderator
I think you can safely assume that he meant 31/12/1915 and go ahead and tag it that way.