Extra soldiers:


Use the War command and select a general to enter into battle.

Assign the maximum number of men to his unit. When the asked for

confirmation for going to war, select the "No" option.

Remove the general from the list of commanders and reassign him

to the post. Return to the troop assignment screen. The number

of men available should be increased by the number that was assigned

earlier. Repeat this process to increase the number of men, but

do not return to the main menu. 



After accumulating enough soldiers, send several of your generals

to war with 300 soldiers each. The extra soldiers will remain

in service only if you win the battle. Note: If you bring more

men into battle than originally present in the attacking province,

there will be no men left in that province after the battle.