marshal together
To gather a number of people or things together; to round up multiple people or things. A noun or pronoun can be used between "marshal" and "together." The event organizer marshaled all the guests together so that the performance could begin. We need to marshal together the heads of the various departments so we can all go over these issues in person.
marshal someone or something together
to organize or gather someone or something together. The leader marshaled all his people together in preparation for the parade. Let's marshal the troops together for the attack.