Here is a 1534 image of a German plow and how it was used. It offers insight into the fighting stance of Pflug, the "plow", as described in the Fechtbuchs.
In the right Plow we are told to hold the sword to the side with the hands crossed below and the pommel close to the right hip short edge up. This makes perfect sense given the turned and pulled back posture the stance inspires--hence from the hand positions and postures in the image above it is not hard to see whence it's name is derived. It resembles that of working with the plow.

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