The Madinan Period · 2 AH
In Ramadan 2 AH, just over three hundred Muslims met a Quraysh army near the wells of Badr. Allah aided them with angels and gave a decisive victory in which the leaders of persecution fell — the day the Qur'an calls al-Furqan, the Criterion.
Related verse
"Allah had already given you victory at Badr while you were weak"
وَلَقَدۡ نَصَرَكُمُ ٱللَّهُ بِبَدۡرٖ وَأَنتُمۡ أَذِلَّةٞۖ فَٱتَّقُواْ ٱللَّهَ لَعَلَّكُمۡ تَشۡكُرُونَ
And already had Allah given you victory at [the battle of] Badr while you were few in number. Then fear Allah; perhaps you will be grateful
Occasion of revelation
The plea for help and the promise of a thousand angels
إِذۡ تَسۡتَغِيثُونَ رَبَّكُمۡ فَٱسۡتَجَابَ لَكُمۡ أَنِّي مُمِدُّكُم بِأَلۡفٖ مِّنَ ٱلۡمَلَـٰٓئِكَةِ مُرۡدِفِينَ
[Remember] when you asked help of your Lord, and He answered you, "Indeed, I will reinforce you with a thousand from the angels, following one another