Silla-Tang alliance

The alliance was established between Silla and Tang dynasty to save Silla from nearby nations such as Baekjae or Goguryeo. Baekjae invaded Daeya Castle and expanded military operation to destroy Silla. During this attack, the son-in-law of Kim chunchu died. A general of Kim chunchu  went to Tang dynasty after he got refusal of Goguryeo to support Silla. The Silla and Tang associated together and made an alliance which is called "Silla-Tang alliance"