Imagine the effect of 10,000 of them doing in all at once.
I stood on the spot on the Manassas National Battlefield where Daniel Webster's son stood with his New Hampshire artillerymen and listened to 30,000 of Longstreet's men coming up over the next rise at the charge. When they crested the rise, someone said later, they looked like an ocean coming. It must have been an absolutely awesome spectacle -- and sound!
Young Webster paid for the privilege with his life. A boulder of New Hampshire granite marks the spot where he was killed.
His artillery managed to hold Longstreet back just long enough, just a few minutes, that the rest of the Union left could get away and not be overwhelmed and crushed. The rest of the battle was a footrace, with death from behind culling the slow and tardy.