Legion intricately controlling multiple Exes

This close Gorman could see the chalk eyes behind the sunglasses. The ex slapped a leathery hand across his mouth even as two or three others pinned his arms and took away his weapons. They carried him through the doors without breaking stride, an actual wave of the dead.
The exes marched into Barracks Eight. Thirty of them marched up the four-story stairwell and split off ten-man groups at each level. The first door to the left on each floor was a small armory where the Gatekeepers kept rifles, sidearms, and ammunition. The exes stomped into each one, grabbed the soldier on duty, and chewed out his throat.

Excerpt From Ex-Patriots, pg 469
Peter Clines
https://books.apple.com/us/book/ex-patriots/id585738393