Source
Source: Niklas Stör, Feldhauptmann und zwei Landsknechte. Woodcut (1538). British Museum, available online from Zeno.org, http://www.zeno.org/nid/20004313909
Many nobles served as cavalrymen, others as infantry officers. This woodcut shows a captain with two of his men.
Source: Niklas Stör, Feldhauptmann und zwei Landsknechte. Woodcut (1538). British Museum, available online from Zeno.org, http://www.zeno.org/nid/20004313909