As of late, my friends and I have had a friendly disagreement on how rolling for reserves is done. As it is written in the book, it says: "At the start of the movement phase...a player must roll a dice for each of their units in reserve...Once all of the units have been rolled for, the player picks any one of the units arriving and deploys it."

Now, I take this as follows: Roll for unit A. See if it arrives. Move to unit B, and so on. Say unit A shows but B doesn't, deploy it.

My friends have interpreted it as this: Roll for all units in reserve at once, and then pick which ones arrive. I.e. I have five units in reserve, Units A-E. I roll for them all together, and get three rolls that are able to enter, and I decide I really need units A, C and E, so I choose those as the arriving units and deploy them.

Personally, I feel that their method is incorrect, as the book clearly states "roll for each unit" That tells me you nominate a unit to roll for and see if it arrives and continue for all units in reserves. What're your thoughts?