Okay, a clue as to who sent the elven archers: It wasn't Tolkien.

Dear Legolas,

It is at times like this that I wish I had other children, because it is looking more and more likely that you will not survive this war. Do you think your second cousin Fred would make a good king?
Your loving father, Thranduil

Dear Ada,
Who on arda is Fred? Have you been watching Harry Potter again?
The big haunted mountain wasn't actually that bad. Gimli was scared of it. There was a massive pile of skulls, as well as an army of ghosts that Aragorn convinced to fight for him. I am writing this on the ship that we commandeered with the help of the ghosts.
Your loving son, Legolas

Dear Eowyn,
I am enclosing a list of housekeeping instructions and general advice for when you get back to the golden hall of Edoras.
1) Never employ anyone with a name like Wormtongue.
2) Ensure that the Mearas are only fed on liquid gold and clover – it's what makes them run so fast.
3) Try to find a good husband – maybe one of the Gondorians?
4) If you ever run out of washing powder, order more in from Rivendell, not the dwarves – their prices are much too high.
5) Do not, under any circumstances, ride out to battle. War is the province of men.

Your loving uncle,
Théoden

Dear Théoden,
Of course, I have every intention of returning to Edoras. I certainly wasn't planning on disobeying you and riding into battle.
Oh, and I found a rider who was willing to take Merry with him. His name is Dernhelm.
Your loving niece,
Eowyn

Dear Pippin,
Thank you for saving my life. It is a shame that my father is dead, but I suppose it would please him to know that he died in such a memorable manner – he always was a drama queen.
Faramir

Dear Legolas,
That still only counts as one!
Gimli

Dear Gimli,
What about the fifteen men I killed that were on top of the Mumak?
Legolas

Dear Legolas and Gimli,
There is a time and place for note-passing, and it is not in the middle of a battle.
Aragorn II Elessar

Dear Aragorn,
Sorry.
Gimli

Dear Aragorn,
I apologize for nothing. It was all the dwarf's fault.
Legolas