Slitherine

In the second scenario of the new Red Guards campaign the objective is to meet up with the units of the first army. However twice in my experience when my forces get to the point they can do this the Japanese control the area and the first army is gone. Thus I lose the scenario even when I have destroyed the enemy, captured their air fields etc. Other times I have made such a meet and won the scenario. Have others had this experience? Seems like a glitch