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Army Cavalry moves at a certain speed because it has riders and those who walk plus heavy weapons, canons etc. The pride of Islam (Sayyidina) Khalid (RA) took his hand picked men with fast horses and bypassed them in a straight line and then joined them back. This is perfectly reasonable and not really a miracle of any kind.
He got caught in the act by Khalafeetur-Rasool (Sayyidina) Abu-Bakr (RA) but that's a different story :P
This cannot be undone and I am sure it will be greatly appreciated.