Rubuta ci gaba don wannan sakin layi - A matsayin ɗan François III d'Harcourt, marquis na Beuvron da Thary-Harcourt, ya kasance memba na tsohuwar Gidan Harcourt wanda ya koma karni na 11. Da ya kai shekara 18, ya shiga soja kuma ya yi yaƙi a dukan yaƙe-yaƙe na zamaninsa. Ya kasance a cikin Yaƙin Sinsheim (1674), Yaƙin Turckheim (1675), Siege na Cambrai (1677)
, Siege na Philippsburg (1688) da kuma yakin Neerwinden (1693). A cikin 1695 da 1696, ya umurci Sojojin Moselle a matsayin Laftanar Janar.