[1] tells:
"There is no article:
- .....
- With uncountable nouns:
Rice is the main food in Asia.
Milk is often added to tea in England.
War is destructive.
War is uncountable?
What about "Star Wars", etc.?
[1]
EXCEPTIONS TO USING THE DEFINITE ARTICLE
English Grammar: EXCEPTIONS TO USING THE DEFINITE ARTICLE
It can be both. The abstract idea of war, like peace, love, hope, etc. is uncountable, but actual conflicts are countable.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.