Some ideas for some new units:
-Dreadnoughts or even Super-Dreadnoughts.
-A mile long aircraft carrier, like what the Americans were planning on building not to long ago.
-Kamikaze for the Japs, like primitive cruise missiles and can destroy ships.
-Longbowmen exclusively for the English, really the English were really the ownly ones who had the patient to encourage such units in the past.
-Crossbowmen, for everyone else, not as good at attacking as the Longbowmen.
-Peaceful resistors, for the French, not good at attacking, defending, doing anything. Only joking!
-M1 Subs, Subs with bombard but can't go out to sea, weak at defending, not fast and not high attack, Say 2.2.2 with bombard 4, disappear when AEGIS Cruisers comeout.
P.S M1 Subs did exist, it was a sub with a single cannon on top, but sank as soon as it got in rough seas and was slow due to big gun on top.