you did not charge with horse or camel for whatever god gave his apostle from them. in any case god gives authority to his apostle over whomsoever he please. god has power over everything.
وما أفاء الله على رسوله منهم فما أوجفتم عليه من خيل ولا ركاب ولكن الله يسلط رسله على من يشاء والله على كل شيء قدير