vindication

US /ˌvɪn.dəˈkeɪ.ʃən/
UK /ˌvɪn.dəˈkeɪ.ʃən/
1.

sự minh oan

the fact of proving that what someone said or did was right or true, after other people thought it was wrong:

:
The army's victory is being seen as (a) vindication of their tactics.