Tuhia he whakamāramatanga mō tēnei wāhanga - Ko Clarke tētahi o ngā hōia o Wīwī-Wīwī tino whai mana, tino pūmanawa hoki i roto i te ope taua o Wīwī i te wā o Napoleon. He hononga piri tana ki te Irish Brigade o Parani. I mahi tona papa i roto i te Rōpū a Dillon (i mahi a Clarke i tetahi wa) me te papa o tona whaea me etahi o ona matua keke i mahi i roto i te Rōpū a Clare. I te pakarutanga o te French Revolution, i mahi a Clarke i nga Pakanga Revolutionary French i te Army of the Rhine, a, i te tau 1793 i whakatairangahia ia ki te "général de brigade". I te tau 1795, i mauheretia a Clarke mo te wa poto. Whai muri i tana tukunga, i noho a Clarke ki Alsace tae noa ki te wa i tukuna ai ia e Lazare Carnot ki Itari hei rangatira rangatira mo Napoleon Bonaparte, tae noa ki tana tono ki Sardinia. Whai muri i te 18 Brumaire, i mahi a Clarke hei Tumuaki o te Tari Topographic, Kaunihera o te Kaunihera, he Hekeretari o te kawanatanga mo te ope taua me te moana. I te pakanga ki a Austria i te tau 1805, i tohua a Clarke hei kawana o Vienna, i te pakanga ki a Prussia
i te tau 1806 i mahi ia hei kawana o Erfurt me Berlin.