expression
indicates patient of a causative expression
A formal, somewhat literary pattern used after a noun to mark the person or thing made to do something in a causative construction. Often seen in classical or written Japanese; in modern speech, に is more common for the same role.
See also: して
社長は秘書をして書類を届けさせた。
The company president had his secretary deliver the documents.
彼は部下をしてその仕事を完成させた。
He made his subordinate complete that task.