2 (U.S. history) the war fought from 1861 to 1865 between the North and the South, sparked off by Lincoln's election as president but with deep-rooted political and economic causes, exacerbated by the slavery issue.
A barrage is a term used to describe extensive artillery fire against enemy positions. Barrages were classified as light, moderate or heavy. A light barrage amounted to six or seven shells every ten minutes. A moderate barrage was thirty shells a minute and a heavy one, fifty to sixty shells a minute.
The threat of bombing revived interest in a technology that had been invented several decades earlier but not developedâradar. Radar works by sending out radio waves and detecting any reflections from distant objects.roximity fuzes, like the modern one shown here, are attached to shells. A tiny radar set within the proximity fuze triggers detonation of the shell when it is close to the target. Proximity fuzes were developed during World War II, but remain in use today.