Greg's bribing of Monaco seems to me to have been a mistake. As it was, Monaco's troops were acting as buffers between his units and Napoleon's in the Arabian peninsula. But once they declared war, France could now just plow through them (since they are podunk spearmen), get to Greg's units (including a GG) and then take the city-state, claiming it for themselves. I would have left them as neutral.
he did it only because people were asking for it in the chat. He even said that it was not in his plan since he was using a lot of gold to get a faster unit production.