
Originally Posted by
Randal
They didn't wait for the Hastati to break. They waited for the enemy to become tired and worn out and for enemy morale to weaken.
Many enemy armies like Celts would arrange their best, bravest, strongest and most heavily armed warriors up front. These were the leaders, the nobles who led by example and inspired the lesser levies to bravery. Once these became tired and dispirited as the enemy refused to give way after a longish slog, they would be much more vulnerable to renewed attack than they would be at the start of the battle.
Holding large parts of their army in reserve probably allowed the Romans to mount aggressive charges and continued attacks for far longer than forces who simply arranged their armies in a big block. In a big block the rear ranks provide cohesion and boost morale, but as Cannae and other battles demonstrated they did not exactly make the formation that much stronger. (Pike phalanxes aside) Even though it's mostly the front-ranks fighting, the rear ranks would tire out physically and psychologically from incessantly being under threat of (missile) attack and uncertain of what is happening up front. A fresh line would not suffer from these issues.
All these reserves must also have allowed far greater tactical flexibility. Weaker points can more easily be reinforced, breakthroughs exploited, etc. Keeping three lines seems like an insanely large quantity of reserves, but if we accept the school of thought that said battles for the most part were rather tentative affairs with fierce hand-to-hand combat occurring only in shorter bursts or locally, until one side gained the advantage and the other broke, then it becomes far more believable.
In the game engine it doesn't work like exactly like this, but fresh troops do have a huge advantage in killing rates. If you deploy your army in a thinner line on guard-mode, fight until the enemy gets tired and then move your fresh second line in, you can get the advantage a deeper single-line would not have gotten.
Admittedly, in my Roman armies I mostly use the third line to intercept cavalry attacks. And I don't play multiplayer, I don't know if historical Roman tactics stand any chance there. I suspect not.
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