who attacked the elves in black clover

The elves in Black Clover were attacked by the Spade Kingdom's army led by their leader, Emperor Megicula. The elves had no choice but to fight back to protect themselves and their homeland, even though they were severely outnumbered. The war between the elves and Spade Kingdom lasted for many years, and the elves suffered heavy losses on both sides. Ultimately, the elves were able to drive the Spade Kingdom away, but it came at a terrible cost.