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In page Howitzer:

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As heavy field howitzers and light siege howitzers of the late 19th and early 20th centuries used ammunition of the same size and type, there was a marked tendency for the two types to merge. At first, this was largely a matter of the same basic weapon being employed on two different mountings. Later, as on-carriage recoil-absorbing systems eliminated many of the advantages that siege platforms had enjoyed over field carriages, the same combination of barrel assembly, recoil mechanism and carriage was used in both roles.[citation needed]