Unit Upgrade

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Regiments and ships inside an army or a navy may be changed into different unit type. For that, first select the units (use Shift+Click for multiple selection), then click upgrade button and select a unit type. After the swap, unit will be reduced to 1% strength. Since 1% of replenishment costs 1% of base unit cost, unit upgrade costs the same as unit construction of the new unit. The following rules for possible conversions apply:

• Regiment/ship types must be researched and available to the owner nation.
• Small ships cannot be converted into big ships.
• Armies with upgraded units are not retreating, in battle, or on transport ships.
• Navies with upgraded units are not retreating, in battle, or transports armies
• Big ships can be upgraded only in a naval base of sufficient level.