Translation of "Dreyfus's" in French

Much closer than Dreyfus's handwriting.

Correspondant beaucoup plus que celle de Dreyfus.

Who learned how to mimic Dreyfus's handwriting,

un autre espion qui a appris à copier l'écriture de Dreyfus,

So they compared Dreyfus's handwriting to that on the memo

Ils comparèrent l’écriture de Dreyfus à celle du mémo