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Napoleonic artillery consisted of horse artillery, which was generally light and mobile field artillery and siege guns, which were generally too heavy and slow to be much use on the battlefield. The main weapons were cannons (firing canister or round shot) and howitzers (which fired on a high trajectory, normally using exploding shells). The British also introduced Congreve Rockets by the end of this period. The firepower of artillery in this period is often over estimated and at longer ranges could cause few casualties but like artillery throughout history had a considerable psychological impact on those under fire. Round shot made up around 70% of all ammunition fired and if used correctly could shatter a wagon or destroy a horse bouncing through troops in column formation but doing little to those in line unless fired at right angles. A French 8pdr gun (or British 9pdr) would have an effective range of about 800 yds with roundshot, which could then bounce or second graze for a considerable distance after impact, or 500 yds with canister (a cartridge filled with musket balls having a shotgun-like effect at close range). Canister was not always effective and the British normally did not use it at ranges beyond 350 yds but it could be lethal and tests indicated that a 6 pdr could deliver 55 hits at 200yds but this dropped to only 6 hits at 600 yds. Rate of fire was thought to be about 2 roundshot or 3 canister per minute in battlefield conditions. Field artillery could keep up with the main army in good weather covering 10 -15 miles a day although a British 6 pdr gun carriage and limber would take up 60ft of road while in transit!