The Believers were able to quench their thirst, and they dug holes all along the Wadi that was at once filled by the swelling of the waters. They washed their clothing, heavy with sweat, and performed their ablutions. Last, but not least, the shifting sands that rendered their advance so difficult, grew solid by the damp, and made the ground firm beneath their feet. "_He sent down upon you water from Heaven that He might thereby cleanse you, and cause the pollution of Satan to pass from you, and that He might gird up your hearts, and stablish your feet by it._" (THE QUR'AN, VIII, 11.)
For the idolaters, the storm was most disastrous. It overtook them in soil known as "Sabkha," signifying low-lying clay mixed with salt, churned by wet into greasy, sticky mud. Their camels slipped up and fell, their long legs comically gliding backwards, powerless to rise without the help of their drivers. Horses floundered, their hoofs sinking in the mire and, unable to find foothold, dropped back on their riders. The confusion and tumult cannot be described, and the efforts of the Unbelievers, to extricate themselves, hampered their advance and exhausted them by fatigue.
The Believers, being cleansed, purified and refreshed, passed the night in invigorating sleep. They did not even take the trouble to post sentinels, relying blindly on the words of the Prophet who assured them that the angels would guard the camp. He alone remained wakeful, absorbed in prayer. "_Recollect when sleep, a sign of security from him, fell upon you._" (THE QUR'AN, VIII, 11.)
The hour arrived when the fate of Islam was to be decided. It was on a Friday, the seventeenth day of the month of Ramadhan.
[Illustration: _Believers perceiving the New Moon of the Month of Ramadhan._]
Hubbab-ul-Ansari, renowned for his sage counsels, craved permission to be heard, 'O Prophet!' said he; hath the spot where we are now encamped been pointed out by a Revelation, and therefore we are forbidden to go forward or retreat? Or are we free to discuss the choice of ground befitting warlike strategy?'--'No Revelation hath imposed this place upon me. Speak freely and explain any stratagem that thou dost judge the most advantageous.'--'In that case, strike the tents,' Hubbab rejoined, 'and with our troops, go down the channel of the Wadi and fill up every well we pass until arriving at the last. There thou must dig a reservoir that will fill itself with all the water running under the sand, whilst the wells higher up, which we shall have choked, will have run completely dry. I know the strength and direction of the stream. Thanks to this reservoir, our warriors, during the battle, will be able to refresh their burning throats or relieve their sufferings if wounded, but our adversaries will not find anywhere in the surrounding country a single drop of water wherewith to slake their thirst.'