Good thread. Basically, ancient cavalry goes for flanks or rear of the enemy - or goes for a gap in the front line.
Alexander's cavalry had great success against the Persians because a great number of the Persians were skirmishers, archers and slingers. And skirmishers will generally run away from an enemy charge, particularly a cavalry charge. And once the skirmishers start running, spearmen of low quality (poorly trained levies) may start running too. From there it's only a short step to the whole army panicking and fleeing for their lives.
Big, low quality armies are often a liability - more people on the battlefield only means that there is more people who might panic and run, spreading panic throughout the army. People have more in common with sheep than with wolves.
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