Also keeping in mind that conscription doesn't need to mean everyone of age, but could just be one person from every family, or a certain number of people from a certain size of village/hamlet/community/town, it would make sense that at least some of the army brought against Erasmus aren't as well trained. Of course, that could also be the whole, they're the new recruits thing. What better way to get them blooded than tossing them into a siege that seems a pretty cut and dried victory?

Most peasants, even in England, would probably not actually want to be caught with a bow as it would surely mean they've been poaching larger game than they're allowed to take from the lord's land. Although not every country had that rule, it would be fairly prevalent. Peasant weapons were most often their farm tools re-imagined, or slings. Though I honestly have no idea what most conscripts were given when they were brought into an army. Most probably, unless it was a regular thing (which isn't the case here anyhow, I'm just babbling because babbling is fun), they were expected to bring their own or pick something up from a dead enemy. 

Pikes can be useful in closed quarters, as moving forward with them would require the whole phalanx to be facing the same direction, so they'd be susceptible to attacks on their flanks and from behind, but then city streets would offer some protection from that. Still, in order to be offensive with pikes, you'd want well-trained men. They do make a great defense, but against enemies on walls... Maybe not so much.