Read this paragraph from The Dark Game.

Realizing that they could do more if they banded together, groups of the Richmond Unionists began to organize. As Van Lew built stronger relationships with wounded soldiers, the Unionists made plans to hide Union soldiers who escaped from Libby Prison. In fact, the Van Lew mansion became a primary safe house, a place where escaped prisoners would be hidden and cared for. Elizabeth, her mother, and their servants did all they could to prepare the escaped soldiers for the treacherous journey behind enemy lines as they attempted to rejoin their fellow soldiers. The Unionists well understood that every escapee was a potential source of valuable military intelligence, and they made certain that each soldier was debriefed before starting back to the Union lines.

This paragraph is mainly about how

Van Lew prepared the Union soldiers to return to their army.
Van Lew’s home was a safe house for escaped Union soldiers.
Van Lew obtained information from escaped Union soldiers.
Van Lew’s mother and servants were part of her secret operation.