Well actually after Marius gained his first consulship he had to levy fresh troops. The Senate hoped he would lose his popular support after the resentment of levy, but anyway.. Marius levied enough troops to bring the current legions in Africa up to strength. After the African campaign, Marius disbanded his army and took over the troops from Rutilius Rufus that he had been training. Point is, the first mules were Marius' men he levied for the African campaign, as its common knowledge among Marius adaptations were his banning baggage train and pack mules. After all, they are called Marius' mules and not Rufus' mules for a reason.
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