Archers and Marksmen are level 2 creatures of Castle recruited from Archers' Towers.
"Archers and marksmen are lightly armored troops armed with crossbows for ranged combat and daggers for light hand-to-hand fighting. Marksmen can get off two shots in each ranged attack." RoE manual
Heroes with a specialty
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Strategy
OK, archers are good to boost the frontline griffins and pikemen in the early game to destroy most low-tier melee neutrals, upgrade them fast; marksmen deal twice the damage literally and are even more effective against those melees, possibly letting you take on tier 4-5 melees with minimal casualties, slow would help with this tactic a lot.