coloquialism
mobilization.......................
The word that means gathering resources and preparing for war is "mobilization." Mobilization involves the process of assembling and organizing military troops, equipment, and supplies in anticipation of conflict. It can also refer to the broader preparation of a nation's economy and society for wartime efforts.
Impromptu or Improvosation is the answer
A word that means "opposed to war " is "Pacifism".
Emancipate is a word that means free.
Postbellum
The root word for "bellicose" is the Latin word "bellum," which means war.
Antebellum. Ante means before and bellum means war.
bellicose
Victory.
Hostilities.
The 5-letter word peace means the absence of war.