Time Is the Most Neglected Dimension
Time is the most neglected dimension in existing battle reconstructions, focusing as they do on static diagrams of force dispositions. Our more dynamic model [discussed in the book] shows that time was just as important as force and space in shaping the battles concerned. The great majority of the engagements involved some form of ‘race against time’, be it a surprised army rushing up reinforcements before the forward troops were overwhelmed, an army in a ‘revolving door’ battle striving to break through and roll up the enemy line before its opponents did the same, or a Roman or Punic army trying to win the infantry contest before the enemy cavalry encirclement took effect. Deployment may have taken many hours, and we know that cavalry and light infantry skirmishing could continue almost indefinitely as long as the troops had a safe place of refuge where they could recover before sallying forth once again, but once both sides’ heavy forces came into action, the pace of events quickened and battles could reach a decision with remarkable speed.
The ‘battlefield clock’ created by wide-ranging grand tactical manoeuvres gives us some idea of how long it might take for combat to be resolved. In large battles, it would obviously take longer for troops to cover the greater distances, but combat itself also seems to have lasted longer because of increased formation depth, so the two factors largely cancelled one another out. Heavy cavalry and Greek hoplite combat were usually much quicker than clashes between other troop types, and it was rare for such contests to remain undecided until other contingents intervened. Roman legionaries, by contrast, could hold out for a lot longer thanks to their stubborn resilience and their multiple line system. It was always possible for shaky or disordered troops to collapse at the first shock, but the generally longer duration of Roman infantry combat helps to explain why cavalry double envelopments became such a characteristic feature of battles during the Punic Wars.
— Philip Sabin, Lost Battles, pp. 223-24