Pompey has been exiled from Rome by his treacherous former ally, Julius Ceaser, after his failure in the civil war. While in exile, he happens upon a mysterious looking ship from the future that he takes residence in. An intelligent man, he discovers how to use it after educating himself on its technology. The ship is able to grow sperm and egg cells from scratch, which allows it to grow humans in vitae wombs at an exponential rate. With this tech, Pompey decides to create an army for himself and take revenge against his hated rival.
These soldiers are grown to adulthood within the vitae womb within 3 years. They are implanted with Pompey's knowledge of the time period, as well as battle tactics while in utero. They are trained mentally and physically while growing, raised in a virtual world to work together, and function as a cohesive army. They are also instilled with complete loyalty to their creator and made to be very disciplined without fear. When they are decanted, they are at the physical and mental maturity of 25 years. These men are the perfect warriors in every regard except one: they have lower amounts of testosterone than usually found in males, due to some quirk in the ship's tech that can't be repaired. Due to their lack of testosterone, they lack sexual urges, are smaller in stature than most soldiers, and lack much muscle mass. But like the good Lord Jupiter says: when you are given lemons, make lemonade. Pompey decides to improvise and work with what he has.
Pompey doesn't want to attack Rome immediately, but work his way up to that goal by conquering other countries first by defeating their armies. After taking over other nations and building his own empire, he will eventually turn his sights toward his prize and murder Caesar. It takes time and resources to produce each batch of soldiers, and they cannot be easily replaced. Pompey would like to get as much mileage out of his men as he can, so each batch is an investment. How can he turn these warriors into an effective fighting force ?