Using a Crossbow in Battle Was an Excommunicable Offense

+UCatholic, Billy Ryan: In historical texts, references to the crossbow were practically nonexistent in medieval Europe from the 5th century until the 10th century. The crossbow appeared in 947 during the siege of Senlis, in 984 at the siege of Verdun, and made a significant impact at the battling of Hastings in 1066. By the 11th century, the crossbow was commonplace as a battlefield weapon. More on this here.