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"You may have any number of Prussian howitzers, as they have all been withdrawn now and replaced by rifled 6-pounders and 4-pounders (which fire 13-pound and 9-pound heavy shells). " Engels to Weydemeyer
http://www.marxists.org/archive/marx/works/1865/letters/65_03_10.htm
Engels To Joseph Weydemeyer In St Louis
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Source: MECW Volume 42, p. 121; First published: abridged in Die Neue Zeit, 1906-1907, and in full in Marx and Engels, Works, Moscow, 1934.
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Incidentally, I am most grateful to you for your explanations about military organisation in America, it was only as a result of them that I obtained a clear picture of many aspects of the war there. I have been familiar with the canons Napoléon for many a long year, the English had already replaced them (light, smooth-bore 12-pounders with a charge weighing 1/4 of the ball) when Louis Bonaparte re-invented them. You may have any number of Prussian howitzers, as they have all been withdrawn now and replaced by rifled 6-pounders and 4-pounders (which fire 13-pound and 9-pound heavy shells). I am not surprised that the elevation of your howitzers is only 5°, it was no higher with the old long howitzers the French had (until 1856), and, if I am not mistaken, the English ones were only a little more. In general, the high-angle fire from howitzers has been used for a long time only by the Germans; its great unreliability in range-finding in particular had brought it into disrepute