Surat Al Anfal: (9-10)

{إِذْ تَسْتَغِيثُونَ رَبَّكُمْ فَاسْتَجَابَ لَكُمْ أَنِّي مُمِدُّكُم بِأَلْفٍ مِّنَ الْمَلآئِكَةِ مُرْدِفِينَ} [الأنفال: 9]

9- Remember the favor of your Lord when you were near the enemy seeking His Help and victory. The Prophet (peace be upon him) was invoking Allah frequently in reverence and submission asking his Lord to fulfill His Promise with victory.

Thereupon, Allah responded to the invocation of your Prophet and sent down one thousand angels consecutively.

{وَمَا جَعَلَهُ اللّهُ إِلاَّ بُشْرَى وَلِتَطْمَئِنَّ بِهِ قُلُوبُكُمْ وَمَا النَّصْرُ إِلاَّ مِنْ عِندِ اللّهِ إِنَّ اللّهَ عَزِيزٌ حَكِيمٌ} [الأنفال : 10]

10- Sending reinforcement to you was just a glad tiding that you will gain victory and so that you feel comfort. Allah is able to provide you victory over your enemy without sending reinforcement because victory is being asked from Him alone, and He is the Powerful who cannot be defeated by anyone, and the Wise in all He legislates and destines.