Mod leader of the SSHIP: traits, ancillaries, scripts, buildings, geography, economy.
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If you want to play a historical mod in the medieval setting the best are:
Stainless Steel Historical Improvement Project and Broken Crescent.
Recently, Tsardoms and TGC look also very good. Read my opinions on the other mods here.
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Reviews of the mods (all made in 2018): SSHIP, Wrath of the Norsemen, Broken Crescent.
Follow home rules for playing a game without exploiting the M2TW engine deficiencies.
Hints for Medieval 2 moders: forts, merchants, AT-NGB bug, trade fleets.
Thrones of Britannia: review, opinion on the battles, ideas for modding. Shieldwall is promising!
Dominant strategy in Rome2, Attila, ToB and Troy: “Sniping groups of armies”. Still there, alas!