Which act of espionage did Van Lew perform before she was recruited as a spy by General
Benjamin Butler?

First step boogie reader wanting to read your article explain the condition that levi factory second step describe the effects working factory working on the workers

12 days because 1/4 is 25% of 100 if 100 is equal to 1 pound then multiply 3 by 4 which equals 12

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.