The command makes the specified country the march of the second specified country.
create_march [country tag] [country tag]
|Country Tag||The tag of the country you wish to make a march.|
|Country Tag||The tag of the country the first specified country should be a march for.|
create_march NOV UTR
NOV is the country tag of Novgorod. UTR is the country tag of Utrecht. This command would make Novgorod a march of Utrecht.