What information did Van Lew relay to Union army commanders?

The information that Van Lew relayed to the Union army commanders were:

1. where the prisoners had been

2. who commanded which rebel armies

3. the morale of rebel

4. where the rebel troops were headed

Explanation:

Elizabeth Van Lew was an effective Union spy who was a member of Richmond, Virginia society.

She fervently opposed slavery and secession as a result was instrumental in giving Union Army Commanders those information. She kept writing her thoughts against slavery in a diary which she hid in her backyard.