I'm referring to military forces subduing another group of military forces. Subduction is what I initially thought of but that specifically refers to the geological process involving tectonic plates. I'm trying to say that "the ... (act of subduing) the x guard was legitimate and legal" but was hoping for a word (like subduction except it doesn't mean what I want it to mean) instead of a phrase. Thank you!
"Subordination" is an act.
: placement in a lower class, rank, or position : the act or process of subordinating someone or something or the state of being subordinated.
//The price is individual subordination to the group and limited autonomy of the nuclear family.— Corinne N. Nydegger
//After 1688, as before, the message was one of subordination to divinely constituted authority, whether of kings or of one's social superiors.— Richard W. Davis
Since 1595, according to https://www.merriam-webster.com/dictionary/subordination
subordinate (Entry 3 of 3) transitive verb
1: to make subject or subservient. https://www.merriam-webster.com/dictionary/subordinate#h3