Background Pony #0758
Friendship is Witchcraft I guess.
Randopony

Peezasheet
Fallout Equestria
Stridershy

“Whats that sound?”
 
“War were declared.”
TheOtherPinkiePie
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.
Friendship, Art, and Magic (2017) - Celebrated Derpibooru's five year anniversary with friends.

Bleh...
Day one, war’s begun  
Come on Johnny, get your gun  
At fruit camp we learn to shoot  
Boy, my helmet sure looks cute!  
March off, rondez vous  
Hey, I’m speakin’ Fancy too!  
Agent Orange, just wait and see  
Apple Tanks are all we need!

 
(Come on now, we’re just gettin’ started!)
 
Day Two, lots to do  
Rarity is working too  
War is like an apple farm  
Raze that field and raise this barn  
So far, it’s a breeze  
Some civilian casualties  
Hit your mark, a fatal blow  
Grab your partner, do-si-do!

 
(Yee Haw! Play it, son!)
 
Draft horse, no remorse  
Alpha, Bravo, Charley Horse  
Family bonding, selling bonds  
Signing treaties, singing sons  
Take off, bombs away  
In my plastic aeroplane  
Hope my backup gets here soon  
Hey, It’s Twilight Sparkle’s balloon!

 
Day Three, out at sea  
In my apple submarine  
In the silence, spendin’ time  
Ruminatin’ all my crimes  
Wake up! Not done yet  
Battle time all hands on deck  
We can sink their battleship  
Burn it to a honey crisp  
White flag? we’re not done  
Got those cowards on the run  
Round them up, no need to stall  
Take no prisoners, KILL E’M ALL!

 
(Get along lil’ doggies! How do you like THEM apples?!)
 
Day Four, won the war  
Loyal to my apple corps  
Ponyville gives amnesty  
Red delicious victory  
War horse, proud to be  
Freedom isn’t everfree  
Hung my ribbons at the door  
That’s how Apples won the war!
D50
The End wasn't The End - Found a new home after the great exodus of 2012

No, that’s how the war was avoided!
delete
Not a Llama - Happy April Fools Day!

Unicorn.  
Earth pony.  
Pegasus.  
Long ago, the 3 tribes lived together in harmony.  
But then, everything changed when the rainbow nation attacked.  
Only the Alicorn, a combination of all 3 ponies, could restore balance. But when the world needed her most, she vanished.  
A hundred years passed and my sister and I discovered the new Alicorn, a unicorn named Twilight Sparkle. And although his magic skills are great, she has a lot to learn before she’s ready to save anyone. But I believe Twilight Sparkle can save Equestria.
Dashy
The End wasn't The End - Found a new home after the great exodus of 2012

@Xidphel  
I guess the sisters are either Applejack and Apple Bloom or Rarity and Sweetie Belle, and they’re fighting against the pegasus nation? :3
delete
Not a Llama - Happy April Fools Day!

Unicorn.  
Earth pony.  
Pegasus.  
Long ago, the 3 tribes lived together in harmony.  
But then, everything changed when the rainbow nation attacked.  
Only the Alicorn, a combination of all 3 ponies, could restore balance. But when the world needed her most, she vanished.  
A hundred years passed and my sister and I discovered the new Alicorn, a unicorn named Twilight Sparkle. And although his magic skills are great, she has a lot to learn before she’s ready to save anyone. But I believe Twilight Sparkle can save Equestria.
Background Pony #A9C6
Episode from “Cutie Mark Chronicles AKA Flashbacks were fillies earn their cutie marks”
Squak

@ED-SKaR  
no the first hit was Cloudsdale and its closest to Ponyville so… you are close
DashGashPlash

Everything changed when the Sonic Rainboom attacked.
delete
Not a Llama - Happy April Fools Day!

@Background Pony  
DAMN IT! I WAS JUST ABOUT TO POST THAT!
blargin7

War, huh? What is it good for?
Background Pony #68BE
Everything changed when the Rainbow Nation attacked.
Background Pony #4015
Almost nopony survived the rainbow wave that swept across Equestria.
Cyris

Another one of my old Youcaps, huh?
Greenjack
Not a Llama - Happy April Fools Day!
The End wasn't The End - Found a new home after the great exodus of 2012

so that’s a megaspell then?
Applejack
The End wasn't The End - Found a new home after the great exodus of 2012

I remember…
Mayojar77
The End wasn't The End - Found a new home after the great exodus of 2012

^except when Ponies are involved, because then things get weird.
Byakugan01
The End wasn't The End - Found a new home after the great exodus of 2012

War…war never changes.