Another gameplay example of shooting. In this situation we have a German AR unit on side of a river with a Soviet INF unit on the other. While the river is impassable where the AR unit is at, it does not block LOS.
The AR unit rolls a 2, adds its +4 to it for 6. The INF unit rolls a 1 and adds its +2 (Unit already had one FP) the result is 6 to 3. Which is double the unit takes 2 additional FP hitting its max of 3FP. The INF unit is destroyed. Remove from the game and reduce the Soviet cohesion number by 1.