Question

Rocket launchers might seem like a 20th-century phenomenon, but they made a few appearances on Civil War battlefields. Confederate forces reportedly experimented with Congreve rockets, a British-designed explosive that had previously seen action in the War of 1812. These weapons resembled large bottle rockets and were so inaccurate that they never saw widespread use.

Meanwhile, Union forces employed the Hale patent rocket launcher, a metal tube that fired seven- and 10-inch-long spin stabilized rockets up to 2,000 yards. While a vast improvement on the Congreve, these projectiles were still quite unwieldy, and were only generally used by the U.S. Navy.
short summery

Answer 1

Confederates experimented with British-designed Congreve rockets—large, bottle-rocket–like explosives that were highly inaccurate and saw little use. The Union used the improved Hale spin-stabilized rocket launcher (firing 7- and 10-inch rockets up to about 2,000 yards), but these unwieldy projectiles were mainly employed by the U.S. Navy.