The Clans
In the name of God, Most Gracious, Most Merciful.[33:9]
O ye who believe! Remember the Grace of God, (bestowed) on you, when there came down on you hosts (to overwhelm you): But We sent against them a hurricane and forces that ye saw not: but God sees (clearly) all that ye do.

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* v.9 : In this verse is summed up the beginning and the end of the fateful struggle of the Siege of Madinah in A.H. 5. The composition of the unhallowed Confederacy that came to destroy Islam is referred to in the Introduction. They came with a force of ten to twelve thousand fighting men, an unprecedented army for that time and country. The battle is known as the Battle of the Trench.
* After a close investment of two to four weeks, during which the enemy were disheartened by their ill success, there was a piercing blast of the cold east wind. It was a severe winter, and February can be a very cold month in Madinah, which is about 3,000 ft. above the sea-level. The enemy’s tents were torn up, their fires were extinguished, the sand and rain beat in their faces, and they were terrified by the portents against them. They had already well nigh fallen out amongst themselves, and beating a hasty retreat, they melted away. The Madinah fighting strength was no more than 3,000, and the Jewish tribe of the Banu Quraiza who were in their midst was a source of weakness as they were treacherously intriguing with the enemy. And further there were the Hypocrites: see n. 3666 above, But there were hidden forces that helped the Muslims. Besides the forces of nature there were angels, though invisible to them, who assisted the Muslims.
* Allah sees everything. Therefore we may conclude that the discipline and moral fervour of the Muslims, as well as the enemy’s insincerities, intrigues, and reliance on brute force, were all contributory causes to his repulse, under Allah’s dispensation. There were many hidden causes which neither party saw clearly.