Every nation needs to advance in order to survive and the poor and old East Germany is no exception. Today East Germany has 103 bulbs towards monarchy and since someone else has already invented this tech, the cost of monarchy has dropped from 132 bulbs to 123 bulbs. That makes our nation 20 bulbs short. It would be possible to research those 20 bulbs in one turn but that would postpone monarchy by one turn.
Doing science this way is extremely expensive but it may make sense in some cases. I'll lose growth from 5 cities but since the East Germany has more than 5 cities it will pay off in terms of added production and faster growth. Some of the cities only had +2 food making them relatively slow to grow and getting +1 food for the grass tiles greatly speeds up the process of making them bigger.
This is of course a risky moment. Border area cities defended by warriors and workers. Yes, workers can be taken into the cities and they will be defending the city with no risk of getting captured. The promoted warriors are actually quite good at defending against the early military units. A warrior gets a the fortification bonus when in a city - even if not fortified - but a worker doesn't. A veteran worker however is equal to a green warrior when in a city and a vv warrior is better than that. This means it's unlikely for two horsemen units to take a city on hills if it's defended by a warrior and a v worker.
Then again, information is the best defense and scouting the border areas with the explorers is something you may want to do.