How did Wonder Woman's shield withstand machine gun fire?

In one of the pivotal scenes of the movie, Diana goes out into No Man's Land between two trenches. She is eventually held in place by concentrated machine gun fire, using her shield to protect herself.
A normal metal shield would eventually get too hot and break under this sort of concentrated fire. What made Diana's shield special to allow it to withstand this sort of attack?
Best Answer
We don't know but it seems to be a magical artifact of some kind.
When Diana decides to leave the island she scales the tower and takes the Lasso, Shield, and "GodKiller" Sword...all secured in the tower.
YouTube video..the scene is at c.1m10s
Since both the Lasso and Sword are magical it can be inferred that the Shield is a similar object or that it's infused with Diana's power.
As we find out...
Diana is not merely a gifted Amazon, she’s a full-fledged demigod. And rather than “channeling” the gifts of Zeus through her bracelets, etc., Diana is the source of her own power.
So perhaps the same applies to her shield.
It should, however, be noted that this shield is different in appearance from the one in Batman vs Superman but then 100 years pass between the two movies
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Is Wonder Woman shield indestructible?
2 It Is Practically Indestructible Both shields are incredibly durable, but let's not forget that Wonder Woman's was crafted with assistance from Greek gods. With her shield, Diana is able to withstand blasts from the creature Doomsday.Did Wonder Woman have a shield?
It replaced her first shield that she had brought with her upon first entering the world of Men, which had a starburst pattern. Wonder Woman used her new shield when she joined Batman and Superman in the fight against the deformity known as Doomsday.Why does Wonder Woman need a sword?
Some time after World War I, Wonder Woman somehow acquired a replacement for God Killer, the sword that Ares had destroyed. Wonder Woman would eventually proceed to wield the sword against Doomsday, managing to slice off the monster's right arm with it.Superhero Origins: Wonder Woman
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Answer 2
Magical bracelets and armor. In the DC universe, their weapons are made of a metal called amazonium which is nearly indestructible, and only Amazon science can forge it into desired metal shapes. Granted, that's Pre-Crisis.
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