I’ve been thinking about the timescale of the game, note that all the following occur on turn 4:
Tanks (September 1916)
Resumption of Unrestricted Submarine Warfare (February 1917)
US Entry (April 1917 declared, June 1917 first troops arrive in France)
Russian Revolution possible according to Larry’s Russia post (March and November 1917 by the Gregorian Calendar)
Taking this as a baseline, turns, if put into an historical context, last roughly from fall to fall:
Turn 1: Fall 1914 to Fall 1915
Turn 2: Fall 1915 to Fall 1916
Turn 3: Fall 1916 to Fall 1917
Turn 4: Fall 1917 to Fall 1918
Obviously this doesn’t work. Given that the Western Front didn’t bog down until the Race to the Sea ended in November 1914 and maneuver returned to the Western Front with the German Spring Offensive in March 1918, perhaps the following:
Turn 1: Fall 1914
Turn 2: Fall 1914 to Fall 1915
Turn 3: Fall 1915 to Fall 1916
Turn 4: Fall 1916 to Fall 1917
Turn 5: Fall 1917 to Spring 1918
Turn 6: Spring 1918 to Fall 1918
This gets the 4 events whose dates and turn we know for sure in the right time frame. So, if this is followed the war should be over on turn 6.
Given the map board, if the US can do nothing until turn 4, then the first US troops would arrive on turn 5, with reinforcements arriving on turn 6 if the US buys additional transports on turn 4.
Or, perhaps, we shouldn’t conceptualize turns as representing a particular timescale (I certainly never do when playing Axis and Allies), but as an arbitrary mechanism that governs when players are allowed to take their turn, with particular turns triggering events for balance or gameplay reasons.