A problem in civilization 4.

These two islands are on the ocean. If astronomy is a sailboat, it can carry soldiers there. It is best to use a transport ship (which requires an internal combustion engine) ...

Most of the money is used to cover the deficit. There is enough money to adjust the scientific research lever to a high level to speed up scientific research, and it can also be used as a supplement when changing technologies. Finally, it is used to quickly upgrade the old arms.

Quarries can be restored on marble and granite.