(8.5.3, 4th bullet) Then, March into spaces that have at least 1 Population, first into those not yet at Active Opposition, then wherever it is possible to move in the most Underground VC Guerrillas that stay Underground—(and only with that number of Underground Guerrillas, 8.1.2)
I'm not sure how to parse the last parenthetical statement. What is meant by "only with that number of Underground Guerillas?" How can you send more than the most possible? Are you allowed to send less once it is determined that you can send more?
Thanks for the help!