When passing through, it is advisable to buy more nearby cities, immediately strengthen their protection with steam cannons. When attacking enemy cities, the best weapons are steam cannons and siege airships. When capturing several cities, try to make more industrial and commercial areas. Trading areas give more wealth, which can be spent on mercenary troops (they are invaluable when repelling enemy attacks, especially horse sub-divisions, wealth gives a large number of trade caravanolves). Industrial districts give many prototypes, use them in development, which gives free military units.