How do I save Rome from Attila the Hun?

Hint 1 of 13:

Drop by the Vatican and bring Pope Leo with you.

Hint 2 of 13:

You need to convince him that God is powerful.

Hint 3 of 13:

Find a way to create a minor miracle.

Hint 4 of 13:

Attila doesn't know about the future, but you do.

Hint 5 of 13:

The needed "technology" isn't too far ahead in the future.

Hint 6 of 13:

Have you visited Peking in 800 AD?

Hint 7 of 13:

They have discovered fireworks, which would seem like a miracle to Attila.

Hint 8 of 13:

You will first have to get in the Inner Sanctuary of the Buddhist temple.
(See the Peking section for more information.)

Hint 9 of 13:

Ask them for the mask, and they will be happy to give it to you.

Hint 10 of 13:

All you need now is a way to light it.

Hint 11 of 13:

Have you been to the tavern in Dover, 1940 AD?

Hint 12 of 13:

Listen to Churchill's radio announcement.