The Romans' short legs allowed them to finally appear west of Mesopotamia the day before the Han Dynasty's New Year. However, this time in the Central Plains is when weapons are stored, ready to welcome the New Year, as New Year's Eve is also a very important festival.
Even someone like Sun Quan, who has no consideration for soldiers, knows that on this day, he must give all the soldiers a good meal, and also knows that it's best to avoid any actions during this period. After all, upsetting people during the New Year is asking for trouble!
Generally speaking, in the Central Plains, it's typical that if you ruin someone's New Year, you'll be told they won't let you celebrate it ever again. Go enjoy some incense offerings instead!
Thus, after discussions among the high ranks of the Han Army, Zhuge Liang notified the Sassanid Fars and then formally handed a state document to Rome, signed by a group of marquises, very formally.
