Terrain Protection

[Cross]

The following is my current guesstimate regarding terrain protection:

Excellent
Foxhole
Impassable
Rough
Stone Building Rubble
Trench

Very Good
Shell Holes
Stone Building
Wood Building Rubble

Good
Hedgerow/Bocage
Orchards
Soft Sand (dunes)
Trees
Volcanic Sand
Wood Building

Fair
Green Crops
High Grass
Slope
Tilled Field
Wheat Crops

Poor
Bare Earth
Clear
Forest Ground Cover
Secondary Road
Short Grass
Snow
Snowdrifts
Stream
Wooden Bridge

Very Poor
Cobblestone
Deep Water
Marsh/Swamp
Mud
Paddy Field
Paved Road
Pavement
Railway Track
Sand (beach, flat)
Shallow Water
Stone Bridges
Tram Lines

The ones I'm most unsure about include:

Soft Sand/Volcanic Sand (Good? Assuming these represent dunes)
Slope (Fair? Slopes are fair in SPWaW but I don't recall why)
Stream (Poor? Or are these very poor like shallow and deep water?)
Dragons Teeth (Not on the above list, as I'm not sure they provide any protection?)


Can anyone tell me what I've got wrong?

Thanks,
Cross