With this increase I could hold my lines, and move out with a greater force than Lee has.

It would compel Lee to retain all his present force in the defenses of Richmond or abandon them entirely.

This latter contingency is probably the only danger to the easy success of your expedition.

In the event you should meet Lee's army, you would be compelled to beat it or find the sea-coast.

Of course, I shall not let Lee's army escape if I can help it, and will not let it go without following to the best of my ability.
Without waiting further directions, than, you may make your preparations to start on your northern expedition without delay.
Break up the railroads in South and North Carolina, and join the armies operating against Richmond as soon as you can.