Saipan terrain

[plloyd1010]

I actually found a rule in the 1st edition of Saipan.

Marsh
Terrain is all but impassable to non-amphibious vehicles.
Each time a non-amphibious vehicle enters a marsh hex,
the owning player rolls one die. On a result of 5 or less the
unit becomes mired in the marsh and is destroyed. Add 1
to the die roll result for mechanized units. The MP cost for
Foot is 2, Mechanized 3, Motorized 4. Units may not Dig
In (16.2) in marsh hexes.