Diary Page 83 of the 161 Brigade RFA mentions an LL call. Not come across this before in any diaries.
The abbreviation LL means: All available batteries to open fire (sudden or very favourable target) See communication letter code link:
Interesting Artillery communication letter codes plus weather codes: Link:
Also on this link a very good aerial photograph: Ref. - 25 September 1916, Reserve Army front: vertical of Thiepval village, and German front-line and support trenches, while undergoing bombardment by British artillery prior to the Battle of Thiepval Ridge, Somme.
Diary page 83 link: https://talk.operationwardiary.org/#/subjects/AWD000443o
You certainly find many interesting things in these world war diaries, particularly with the help of Google when searching.
by cyngast moderator
YOU find a lot of interesting things. I seem to have less luck with my Google searches, but as I think I've said before, some of that has to do with Google insisting I want American related answers even when I put "British" in my searches!
I wonder if under the Weather Codes UE (Unfit for Registration) is supposed to be UR, which makes more sense for both registration and consistency with the other Unfit and Fit codes in that part of the list. (As great a resource as The Long, Long Trail is, I have found typos from time to time.)