battle formation; battle array
Refers to the arrangement or disposition of troops in a military context. Somewhat formal and often used in historical or strategic descriptions.
The enemy forces had formed a solid battle array and were lying in wait.
They finalized the lineup for the new team.
The lineup for the election campaign was finally settled.
This movie was filmed with a star-studded cast.
The enemy army set up its battle formation at the foot of the mountain.