The requires at least 3 to4 pages thanks for the help I am submitting the three references Artemis Literary Sources will be helpful for information about original/historical sources. 300 is about the Battle of Thermopylae, so try searching for that phrase - battle of thermopylae - in Artemis. You'll get several kinds of info, but the most salient is probably under "Literature criticism," which means people writing academically about literature (and media). Read through the search results carefully! Several of these search results are about 300, as it turns out
As for your question about why the army consulted the oracle regarding the war against the Persians, I recommend two things:
Learn or review what oracles were used for. If you ever find yourself thinking, "I just need basic info about ___," search for it in Gale Virtual
Reference Library, or GVRL. I call this Academic Wikipedia.
NOTE: In GVRL, the search results are sometimes in a weird order. Scroll down the page and look for the source that would be most useful, like Ancient Greece or Encyclopedia of Religion.
Next, look at an actual original source, an ancient text. We mentioned that Gutenberg.org is a good place to look for old texts.
First step: how do I find the right source? Look at the "Library research help folder" to see how. Then, find the text in Gutenberg. (Let me know if you have trouble finding that Herodotus text in Gutenberg.)
Spend some time reading through it, even though there are many thys andthous; try doing Ctrl+F to search for the word oracle in the sections you're reading.
Last, your professor recommended looking at movie reviews. Since 300 was a recent movie, you can just google it, looking for reviews published in newspapers or reputable sites. Rotten Tomatoes might be a good source.