Answer:
Van Lew’s home was a safe house for escaped Union soldiers.
Step-by-step explanation:
You can tell from somewhere in the middle of the paragraph, that it mainly focuses on the Unionist having Van Lew's home as a safe house.
"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."