Grass provides the optimum terrain for both troops with ballistic weapons - bows, guns, etc. - and mounted troops.
Scouts are too exposed in this open terrain to operate efficiently.
Hills can provide one side with an advantage over their opponent through gaining the high ground. However if the hill is too steep, mounted troops are unable to operate efficiently.
Woods make it difficult for troops with ballistic weapons to operate. The canopy provides cover from aerial troops and denser woods prevent formations.
Scouts operate well in the cover of trees.
Marsh is the enemy of mounted troops and the friend of troops with ballistic weapons. All troops are slowed by marsh and become easy targets.
