It doesn’t matter if the land unit survives to retreat or not. Just its having moved into the territory establishes the retreat path.
New units
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Where to buy new kind of units? I want also a description of the unit like attack defense andfeatures
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Check this site: http://www.historicalboardgaming.com
There are no rules for those extra units. You have to make them yourself. But then you can better go to the forum for house rules.