This is book number 1 in the Tau Ceti series.
It's 24 on Mars: a non-stop futuristic thrill-ride, all in one day, through the critical events which were the breaking point for the underclass of Martian citizens and precipitated a revolution to break the Martian colonists free from the formidable Sol System government. The formerly red planet would never be the same, nor would the human race.
It was one day that changed the course of history for the Solar System, raging from hand-to-hand combat to piloted armored mecha suits clashing to an enormous space battle, with dedicated heroes on both sides of the conflict wondering if they were doing the right thing and if they would live to see another day. And wondering, as well, if the spark of this new war that would eventually reach across whole star systems, would bring them peace.