This strategy implied the use of intelligent tactics, something that has been overlooked for some time because of the discredit into which 'battle-history' has fallen. ' s Roman officers therefore had to know how to make a bridge, build roads and camps. Marching order and battle order were based on instructions of some complexity, though not to quite the same extent as those that governed siege warfare. A military engagement in open country demanded exceptional manoeuvring qualities from everybody concerned. The Roman army was the phalanx of Alexander with added flexibility. But this military science was not fixed for all time. When studying tactics, or armour for that matter, the scholar cannot but be struck by the great qualities of adaptability of this Roman army. The impression is that after each defeat the generals drew their conclusions in order to be better prepared the next time round.