A Voulge is another Glaive, or like the Glaive. One large difference is how the secondary blade is attached. Rather than having a socket built for it (like on the Glaive), two thirds of the blade was attached to the side of the pole.
*Disclaimer: I have done extensive research on each of these weapons. I am aware that there are many different versions of each of these weapons. I am not trying to spread false information. If you know and can prove any information wrong, please let me know and I will fix my errors. I have at least three references for all research on the weapons I will discuss through the challenge.