In the sentence (just a sentence to be provided an example, I made it up) ''I think the second World War was more devastating than World War I'' so I checked capitalization rules on Grammarly and I didn't find any reason to capitalize ''s'' of ''second''. However, the application (grammarly) itself finds no mistake when I capitalize ''s'' of ''second'' Is there a grammar rule that regulates this ? Thank you.

  • 2
    Rule 8: Specific periods, eras, and historical events that have proper names should be capitalized. Second is a part of the proper name as World or War is. Similarly, we say "World War One" Commented Feb 11, 2022 at 17:35
  • Yes to what @AndrewTobilko said. You could also write, "I think the second world war was more devastating than the first" (although people usually use proper nouns to refer to those wars). Commented Feb 11, 2022 at 21:10
  • Don't say thanks in the question, it only increases noise. See: Expected Behavior
    – user150280
    Commented Jul 17, 2022 at 8:02

1 Answer 1


Typically we consider the name of the war to be "Second World War". The word "Second" is part of the name, and so is capitalised as a proper noun.

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