These guys will do literally anything for money and have been known to change sides and stab their former employers in the back for just a few crowns.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Whenever Ulli and Marquand rolls a natural 1 on the Mercenary Loyalty Table, they have decided to switch sides, and will be under the control of your opponent from then on. If they are inside a unit, they will immediately leave it and should be placed in base contact with their former unit, counting as charging.