Hello Pieter,This subject is of interest to me too, though I have not yet had the time to really delve into it. From the few articles/books that I have read I understand that the organisation and rank structure of the medieval militia would depend on who was in charge of the town.
If the nobility and/or wealthy merchants were the ones running the show then they or their representatives or people from their class would be the ones leading the militia. And the militia would then often be neighbourhood based. So when marching out en masse they would have X number of men from quarter 1 and Y number of men from quarter 2, probably depending on how many people lived there.
If on the other hand the guilds were in power of the town you would often see the militia organisation be reformed to this system. Z number of weavers, Q number of butchers, and so forth, probably with their alderman leading each group.
These two systems of course did not always work exactly like that, it could be that guilds governed the town but that the militia would still be neighbourhood based (which is more efficient in times of alarm). The other way around, having the wealthy guys run the town but have the militia be run organised guildwise, probably happened a lot less because you would not want the guilds to be able to be easily turned against you, armed and organised, if you were the rich guys on the town council.
The following article is nice to read, though in general about the Holy Roman Empire (in which the Low Countries were situated, except for Flanders):
Eltis, David (1989), Towns and Defence in Later Medieval Germany. Nottingham mediaeval studies, vol. 33, pp. 91-103. ISSN 0078-2122.
I also like this book, which is about the now lost Leugemeete Fresco which showed the town militia of Gent in 1346. The book also tells a bit about who they were, their arms and armour, etc. :
Werveke, Alfons van (1909), Het Godshuis van Sint Jan & Sint Pauwel te Gent, bijgenaamd De Leugemeete: de kapel en haar muurschilderingen van ca. 1346. Deel: [I: Tekst], [II: Lichtdrukplaten], [III: Steendrukplaten]. Maatschappij der Vlaamsche Bibliophilen ; 4e reeks, nr. 15. Gent: Annoot-Braeckman.
Furthermore there is an online (book.google.nl) old article dealing with the shooting fraternities:
Van Asch van Wijck, A.M.C. (1848), De schut- of schuttengilde in Nederland. In: Berigten van het Historisch Gezelschap te Utrecht, tweede stuk, pp. 92-202. Utrecht: Kemink en Zoon.
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Bertus Brokamp