When he removed that base...we both had a thought (Two old farts thinking at the same time

Removal of his base from the front rank, a base with none in contact behind it left my side of the fight with two bases (first and second rank) without contact with the enemy. It was not possible to shift to the left.
Sooo....should a second rank base have been removed instead?
Sorry if I am rambling on. I do try to give enough info up front.
