This optional rule may replace the standard rule in Section 4.2 (page 37), provided that all players participating in the game agree to use it.
If a unit passes through any friendly infantry or cavalry unit, the moving unit must pay an extra inch of rough terrain movement for each friendly unit penetrated, just before starting to cross through them.
A unit may not begin overlapping a friendly unit if it does not have enough movement factors to complete the move and pass entirely through the friendly unit or units.
After paying this extra inch of rough terrain movement, the movement may then be carried out normally without any further penalties.
Artillery units and generals may pass through, or be passed through by, any friendly unit without any additional cost.
