Fighting a war on two fronts is extremely difficult. Lack of resources, lack of focus, lack of a lot of things. It’s better to fight one battle at a time.
If you can’t only fight one battle at a time, then split your group into two smaller groups, with each responsible for one of the battles. This way, even though they might have more limited resources each group can keep their focus on one battle. Then, if one of the battles is won, they can rejoin and are back to all focusing on one battle again.
Have a great day!