Ah, but the answer is not only in one of the above

The "letter" of the Bible is written to Israel (OT) So it applies to them
However the "spirit" of the OT is written to the believers or church.
The "called out ones" are the people of the SPIRIT. We see and hear and follow , not the letter, but the spirit.Rev 19:10 ............. for the testimony of Jesus is the
spirit of prophecy.
So , yes everything happened for real, but then when you and I read , for instance about David and Goliath, we are shown many things in the spirit, that transcends the letter of the history
David , when we look in the spirit, is a picture of the believer and Goliath , the "giant" that stands against the believer (ex: sin) So if we look at
how David took on Goliath, we get to see how God wants us to do it.
For instance: 5 smooth stones (5 senses) from the brook (5 senses washed by the water of the Word)
David comes to the "problem" in the Name of the Lord. The problem is conquered when David first speaks the WORD.
More pictures are hidden in the spirit: David killed a lion and a bear. Same images as in Revelation.Then Goliath becomes the image of the Beast and we see how the believer will fight against the Beast army ....etc.
All OT history, is them also for us , to understand in the spirit, when we pray and ask the Holy Spirit to open its meaning to us.
Here is an interesting note on this being also a picture of the antichrist (one of many such pictures in the OT):
1Sa 17:4 And there went out a champion out of the camp of the Philistines, named Goliath, of Gath, whose height was
six cubits and a span.
1Sa 17:5 And he had a helmet of brass upon his head, and he was clad with a coat of mail; and the weight of the coat was five thousand shekels of brass.
1Sa 17:
6 And he had greaves of brass upon his legs, and a javelin of brass between his shoulders.
1Sa 17:7 And the staff of his spear was like a weaver's beam; and his spear's head weighed
six hundred shekels of iron: and his shield-bearer went before him.
C