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I've been reading a history on Napoleonic artillery and I came across descriptions of the use of Congreve rockets by the Britsh. It says they were never terribly widespread due to their lack of accuracy. They were launched indivitually from troughs at indivitual targets like tybe artillery.
What would the effects have been both on the battlefield and the extent of their use had they been used en mass like Katyushas in the 20th century with numbers making up for indivitual inaccuracy.