
Originally Posted by
slowtarget
Also, it was my impression that the reason why crossbows were so popular for city defense was because, if an army reached your city, you wanted as many people as possible to help in the defense.
A longbowman often trained for many years to be able to be effective at his job, and for that, he (rarely she) was unrivaled until age of firearms. On the contrary, the most difficult task a crossbowman had was in loading the bow quickly and without injuring himself. He could be trained to do this in a relatively short period of time. The skill required to aim and shoot a crossbow did not require years of training.
End result: if you're using crossbows, you could have a much larger defensive force, and your defensive force could be made of people who were not career soldiers.
(I don't have clear sources to back this up: historians feel free to correct me if I'm mistakenly quoting flawed research)