Ancient & modern
As the forces returning from duty in Iraq know best of all, important though amazing technology is, the camaraderie and morale of the unit make the crucial difference. The Romans knew this, too, and took steps to nurture the right frame of mind in their soldiers.
First, punishments and incentives strongly affected personal behaviour. The penalty for sleeping on watch, failing to obey orders or abandoning weapons in battle was to be clubbed to death. But the soldier who performed well was congratulated and rewarded by the general in front of the whole army, while victory usually meant a distribution of booty among the men, often worth a very great deal (a prospect that always did wonders for recruitment).
Second, high-quality leadership brought out the best in the men. Plutarch talks of the respect gained by the leader who shared his men's hardship and dangers. Julius Caesar was never slow to set an example in the front line when his men were in trouble, though it was not a tactic to be repeated too often; a general's death or wounding ran the risk of creating panic in the ranks. Likewise, the successful leader knew how to inspire his men. While it is hard to believe in the great set-piece speeches, delivered to vast armies, 'reported' by all ancient historians (how many soldiers could possibly have heard them?), the likelier practice of delivering brief, individual exhortations to separate units before battle is on record (the emperor Julian did it).
Finally, and most importantly, soldiers were encouraged to develop a strong sense of solidity with the unit in which they were serving. Swearing-in ceremonies had impressive religious connotations; constant drilling instilled in men the discipline of obedience to orders and made them not only look but also feel like soldiers (the Jewish historian Josephus said it prepared body and soul); a unit's gear with its distinctive markings, especially its standards, generated a sense of cohesion and esprit de corps (to lose the standards in battle was a terrible disgrace); and one's own messmates became a focus of especial loyalty (Livy talks of a soldier's tent becoming his 'hearth and home').
Personal honour, pride and shame, confidence in the leadership, and emotional commitment to the unit created the 'All for one and one for all' mentality that service in the legions was designed to generate. For all the hightech weaponry that Western armies wield today, these are still the qualities without which no army can function.
Peter Jones