If you have seen the movie "King Kong River", you will know that the US military howitzers launched a fierce shelling on the bridge where the volunteers were located, and they were stunned to blow it short, originally, they thought of using this trick at night, but they did not expect that they were attacked by the Katyusha rockets of the volunteers, and the whole artillery battalion was destroyed, so many people thought that the power of the Katyusha rockets was exaggerated.

After all, it is a battalion of troops, just a few Katyusha rockets can destroy it, obviously impossible, but this is really not the movie deliberately exaggerated plot, in fact, in the real Korean battlefield, the volunteer army used Katyusha rocket artillery, once the 800 troops of the US army, stunned to eliminate all, then, let's talk about this happened in the Korean battlefield!
The story goes back to the summer and autumn defensive war in 1951, when the U.S. Cavalry Division attacked Tiande Mountain defended by the 422nd Regiment of the 141st Division of the 47th Army of the Volunteer Army. The US army has planes in the sky, artillery on the ground, and tanks in the middle to open the way, and the weapons of our volunteer army are in front of them, that is, millet plus rifles, not to mention an elite cavalry division against a regiment of the volunteer army, which is obviously not at all at one level, and it is precisely because of this disparity in firepower that the US army does not pay attention to the volunteer army at all.
Soon, the U.S. army paid the price for its arrogance, volunteer rifles and grenades, hit the U.S. army in the first attack on the huge losses, which made the U.S. army begin to serious, so soon organized a larger-scale attack, this time, the U.S. army is obviously prepared, they are not in a hurry, first of all, continue to use artillery fire to cover the position.
Unexpectedly, in the evening, the Katyusha rockets of the volunteer army came to the rear of the position, began to counterattack, using a larger area of artillery coverage, the American soldiers were blown up to a miserable sight, at that time, the attacking American army had 800 people, almost 2 battalions of troops, stunned by the volunteer Army's Katyusha rockets were all wiped out, at that time the volunteer army only had 30 Katyusha rockets.
Later, with the support of the volunteer artillery, our army's position was consolidated, thwarted the attack of the US army, and the first cavalry division suffered heavy losses, and later, after the battle, our volunteer army caused a total of 4500 casualties of the US army, and the casualty figures of our volunteer army were not very clear, but from the data, there should be no losses more than the US troops, after all, the defensive personnel, there is only one regiment.