When Lee and the Army of Northern Virginia marched northwest to the Shenandoah Valley in June 1863, how strong (how many men, cannons, etc.) was the force they left opposing the Army of the Potomac across the Rappahannock? Were there any significant additional layers of defense between Fredericksburg and Richmond?

The Wikipedia article on the Gettsyburg campaign indicates that Lee left "A.P. Hill's Corps in fortifications above Fredericksburg to cover the departure of the army, protect Richmond from any Union incursion across the Rappahannock, and pursue the enemy if Hill thought it advantageous." However, General Hill and Third Corps apparently followed the rest of the Army of Northern Virginia to Pennsylvania on June 15th, and obviously participated in the battle of Gettysburg in July, so most of Hill's troops couldn't have been near Fredericksburg at that time.

I've done a lot of Googling, but haven't found a good source indicating how many men (presumably from the Third Corps) were left behind to hold the line at the Rappahannock.

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    Welcome to History:SE. What has your research shown you so far? Where have you already searched? What did you find? Please help us to help you. You might find it helpful to review our Help Centre and, in particular, How to Ask. – sempaiscuba Aug 19 '19 at 18:54
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    I added some edits to indicate what I've found so far. – amh Aug 19 '19 at 19:33
  • Hill's corps remained behind until it became clear, to Hill's satisfaction, that it was safe to follow Lee north. By Napoleonic standards (and possibly forced on them by differences between Western European and North American geography and demographics) the reconnaissance standards of both sides were horrendously incompetent. It might make an interesting question to explore just how much of the variation was in fact forced, rather than due to lesser professionalism in North America. – Pieter Geerkens Aug 21 '19 at 22:06

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