What type of details about francois christophe de kellermann can be gathered from the following bio? Bio: francois christophe kellermann or de kellermann , 1st duc de valmy -lrb- 28 may 1735 -- 23 september 1820 -rrb- was a french military commander , later the general d'armee , a marshal of france and a freemason . marshal kellermann served in varying roles throughout the entirety of two epochal conflicts , the french revolutionary wars and the napoleonic wars .
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