Although they speak their vows of duty, the peasants of Bretonnia do not understand. It is not their business to understand or to think - only to do. They do not know why they are summoned to fight - these things being beyond their regard - yet when the Greenskin hordes are bearing down upon them, low-born men know they must fight or die. Sometimes they are fortunate enough to be armed with rudimentary weapons; bows, with arrows drenched in oil and lit, or dipped in diseased buboes. Unlike Men-At-Arms, Peasant Bowmen are not equipped from the armouries of the castle and so their longbows will often be their own possessions, handed down from father to son and, accordingly, are of variable quality. Peasants who survive a battle may think themselves lucky until they too are stricken by fatal pox, mayhaps from a cut received whilst loading their unfamiliar and cumbersome weapons!
Peasant Bowmen are weak even among weak archers. They have very low leadership, low armour-piercing, and negligible melee stats. However, they are incredibly cheap and disposable. They also are the only ranged units on the Bretonnian roster, so they are a neccessary component of many Bretonnian armies. They do have good range which allows them to pressure enemies from far away. Also, even if they do not deal a crazy amount of damage, volume of fire from two or three units of archers can deal significant damage regardless.