Each one has their own battlefield

Edge who saw the incoming rain of swords smiled and quickly dashed towards the enemy forces. As Edge moved towards the enemy lines, the swords followed. Because they had to concentrate on using the flying swords the enemies had no time to defend themselves. 

Usually, the enemy wouldn't be able to get close while the practitioner uses the flying sword, because of how fast the sword was. In fact, the flying swords the Eastern Kingdom soldiers used were made with both offense and defense in mind. Normally when an enemy gets close they would switch from offense to defense. Yet switching between the two takes a few seconds which they didn't have.