By his own hand - Idioms by The Free Dictionary
by (one's) own hand (redirected from by his own hand)
by (one's) own hand
Committed by oneself or as a direct result of one's actions. Though she put everything she had into the company, it was by her own hand that it became marred by corruption and scandal.
References in periodicals archive
Who fired these shots may never be fully known, but BY HIS OWN HAND
takes a healthy stab at a case with no eyewitnesses.
Ellis' style is to eloquently detail ocean life and illustrate it with drawings by his own hand