Four of 'em is more impressive. Especially after dark.
When I was with the 101st, we were doing an exercise in the back 40.
Being part of a DF team we were wandering trying to find the grid coordinates we were supposed to be at around midnight one night.
Finally I pulled in just beyond some trees into a clearing and proclaimed we were at our site.
Dragged out our sleeping bags to sleep under the stars.... about 20 minutes after we settled in, all hell broke loose. Turned out we situated ourselves about 50 meters infront of a 105mm bty.
Scared the shit out of me, but once we realized what was going on we just lay there and listened to the shells go down range over our heads :)