The Profession-Transference system, which allows switching between laborers and soldiers, is not merely an auxiliary feature but a core innovation linking the economy and military systems inseparably. Sources elaborate on this system within a broader context of labor and occupations:

1. Innovation: "Soldiers as Farmers, Farmers as Soldiers" (Historical Core)

• Historical Inspiration: This system is modeled after the "Tuntian" policy during the Three Kingdoms era, where soldiers farmed during peacetime to produce supplies, and farmers fought during wartime.
• Strategic Flexibility: Players can balance economic sustainability and military power according to real situations, such as releasing soldiers to produce supplies during shortages or rapidly mobilizing labor as reserve troops when enemies approach.

2. Operational Mechanics (Job Transfer)

• Job Switching Process: Players can send laborers to military barracks to become professional soldiers (Sergeants), and soldiers can be reverted to laborers by returning them to the barracks.
• Stat Retention: Soldiers who return to labor retain certain bonuses or statuses from training, making them highly efficient, resilient, and better at defending themselves while working in the fields than regular laborers.

3. Retraining Economics

• Reduced Cost: Retraining laborers who were once soldiers back into soldiers costs only 30%–33% of the resources and time required to train new soldiers.
• Technical Exploit: Advanced players can cancel ongoing retraining, allowing the system to refund resources equivalent to the cost of creating new units, effectively generating free resources.

4. Human Resource Backbone

• Key Human Resources: Laborers handle all tasks from gathering raw materials (wood, iron, grain, meat) and constructing buildings to producing refined goods (food, wine) in workshops.
• Automated Labor System: Idle laborers automatically move to nearby farms and repeat planting tasks, allowing players to focus on macro-strategy.
• Growth Limitations: Population and labor are limited by the number of houses within city walls, and the recruitment speed depends on city morale.

5. Official Appointments (High-Level Job Management)

• Beyond ordinary soldiers, heroes/warriors can be reassigned from generals to official titles in various buildings, such as science or agricultural officers, improving city efficiency and maintaining loyalty.

In summary, the Profession-Transference system acts as a highly flexible "human supply chain", allowing players to effectively respond to economic crises and prolonged wars following Eastern strategic principles.