Mich. Comp. Laws § 750.89: Assault with intent to rob and steal; armed.

Sec. 89.

Assault with intent to rob and steal being armed-Any person, being armed with a dangerous weapon, or any article used or fashioned in a manner to lead a person so assaulted reasonably to believe it to be a dangerous weapon, who shall assault another with intent to rob and steal shall be guilty of a felony, punishable by imprisonment in the state prison for life, or for any term of years.