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From AGEWiki

Reinforcements are the new units you'll need to increase the power and size of your armies and garrison your rear areas.

Obtaining reinforcements varies by game:

• BoA = by event only
• AACW, NCP = By event or via the unit purchase (construction) system.
• WIA = By event or by the "Options" system.
• RoP = By event, by the "Options" system, or via the unit purchase (construction) system.

Reinforcements are oftem confused with Replacements, which are what you need to flesh out depleted regiments, rule-of-thumb is to aim for having 10% of your total force available in replacements.