I need more information on the Hadith. Which collection is it from? Perhaps provide a direct link?
Qur'an 8:12 in context:
Following an attempt on the Prophet's life, he managed to escape and made it to Medina. The Muslims were told they stood no chance of entering Mecca to visit the House of God, and they responding, they would disrupt caravan trade routes to Syria. After 2 years and watching Muhammad's pbuh influence and acceptance growing in Medina, the Meccans sought to save a caravan from attack and to destroy the Prophet and his followers. More than 1,000 marched out against 300 Muslims. Chapter 8 was revealed after the events....
8:0 In the name of God, Most Gracious, Most Merciful
8:1 They consult you about the spoils of war. Say, "The spoils of war belong to GOD and the messenger." You shall observe GOD, exhort one another to be righteous, and obey GOD and His messenger, if you are believers.
8:2 The true believers are those whose hearts tremble when GOD is mentioned, and when His revelations are recited to them, their faith is strengthened, and they trust in their Lord.
8:3 They observe the Contact Prayers (Salat), and from our provisions to them, they give to charity.
8:4 Such are the true believers. They attain high ranks at their Lord, as well as forgiveness and a generous provision.
8:5 When your Lord willed that you leave your home, to fulfill a specific plan, some believers became exposed as reluctant believers.
8:6 They argued with you against the truth, even after everything was explained to them. They acted as if they were being driven to certain death.
8:7 Recall that GOD promised you victory over a certain group, but you still wanted to face the weaker group. It was GOD's plan to establish the truth with His words, and to defeat the disbelievers.
8:8 For He has decreed that the truth shall prevail, and the falsehood shall vanish, in spite of the evildoers.
8:9 Thus, when you implored your Lord to come to the rescue, He responded to you: "I am supporting you with one thousand angels in succession."
8:10 GOD gave you this good news to strengthen your hearts. Victory comes only from GOD. GOD is Almighty, Most Wise.
8:11 He caused peaceful slumber to overtake you and pacify you, and He sent down water from the sky to clean you therewith. He protected you from the devil's curse, reassured your hearts and strengthened your foothold.
8:12
Recall that your Lord inspired the angels: "I am with you; so support those who believed. I will throw terror into the hearts of those who disbelieved. You may strike them above the necks, and you may strike even every finger."
8:13 This is what they have justly incurred by fighting GOD and His messenger. For those who fight against GOD and His messenger, GOD's retribution is severe.
Now you can see, over 1,000 soldiers sought to kill the small number of Muslims. God sent down angels to assist the Muslims, granting them victory by casting terror into the hearts of the enemy.