"River" cell disables shooting and decrease unit’s moving distance. Though it allows a unit to stand on it and shoot through it. If a unit stands on this cell he stops. And if he already stands on the "River" cell his moving distance decreases to the minimal. If a unit always moves with a minimal speed this speed limit is not valid for him. When a unit has a skill to "Run & Attack" and stands on this cell this skill is unavailable. And when a unit stands on the "Field" cell and shoots over the "River" his shooting distance can increase on one cell. A shooting distance increase happens only if the last cell and the next after it is the "River" for a "standard" shooting distance. Otherwise, a shooting distance remains the same. Visually it looks like the river, quick-sands and so on.