Today in my Latin class, my teacher brought up a good question in which another fellow full-fledge historian had no answer to. The question was, assuming that the Senate was the real authority in leving legions, why was Caesar able to levy a legion, then 2 or 3 more(?) for the Helvetian campaign without consulting the senate.
Was it by this time generals/governors no longer cared for senatorial authority.
Also, when Caesar levied his legions, how were they able to becoming a fighting force without training so quick?