AH probably thought we'd be able to take Solidaritet before the reinforcements run out and then we'd get enough reinforcements for them to have a nice weekend. That's what I mean by we weren't supposed to lose because otherwise the loss wouldn't have fallen on Saturday early morning (AH time).
But I guess it's hard for the GM to coordinate these things when you literally spell out what needs to be done and some players just don't read the orders.