two people or more in a fight ie. combat
NVAF (MiG17, MiG19, MiG21) vs USAF/USN Aviation (F100, F101, F102, F104, F105, A1, A4, A6, A7, F8, F4).
That would probably be the United States of America, which entered the war only after Japan bombed Pearl Harbour, Hawaii, in a surprise attack on the 7th of December, 1941.
One who is authorized by governmental authority or the LOAC to engage in hostillties.
A conflagration is a fire, there is no antonym.