Diplomacy: What happens when two units attack each other with unequal support?
Moscow is moving to Warsaw with strength 4 (itself + 3 supports). Warsaw is moving to Moscow with strength 3 (itself + 2 support). The Army in Prussia moving into Warsaw is irrelevant (It's of strength 1, which is also less than 4). The MOS-WAR move has greater strength, so succeeds and the Army in Warsaw is dislodged. The Prussian army remains in Prussia.