Battlefield role
Scouts enemy positions, harasses workers, and threatens archers who wander from their screen.
Scout cavalry earns its cost twice: once with information, once with harassment. Early scouting tells you whether your opponent is building army or economy — the single most valuable fact in the game — and the same speed that finds intel lets you punish whatever they left undefended.
The discipline is knowing what scouts are not. They’re not a battle line, and every scout that dies charging spears is a report you’ll never receive.