Siege gun

Definition and stakes

Albert C. Manucy,  Artillery Through the Ages

“ Loading technique varied with the gun, but the following summary of drill from the United States Heavy Ordnance Manual of 1861 gives a fair idea of how the crew handled a siege gun:
In the first place, consider that the equipment is all in its proper place. The gun is on a two-wheeled siege carriage, and is "in battery," or pushed forward on the platform until the muzzle is in the earthwork embrasure. On each side of the gun are three handspikes, leaning against the parapet. On the right of the gun a sponge and a rammer are laid on a prop, about 6 feet away from the carriage.
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Source: Gutenberg

Thomas Wilhelm,  A Military Dictionary and Gazetteer

“ For the two latter, see Howitzer and Mortar. Guns are subdivided in the U. S. service according to their use, into field, siege, and sea-coast guns. The field-guns consist of two rifle pieces; the 3-inch rifle, adopted in 1861, and the 31⁄2-inch rifle, adopted in 1870 (see Ordnance, Construction of) , and the Napoleon gun, a 12-pounder smooth-bore, adopted in 1857. (See Napoleon Gun.) The only siege gun adopted by the United States is a 41⁄2-inch rifle. ”
Source: Gutenberg

James Mercur,  Attack of Fortified Places. Including Siege-works…

“ As the advanced positions may be subject to the fire of the heaviest class of siege-guns, if any parapet is made it should be of the nature of a glacis of gentle slope and little command. Infantry trenches should be made narrow and deep as a protection against shells and shrapnel (Pl. IX, Fig. 84) , and gun-emplacements should be as small as practicable and almost entirely in excavation, for the same reason. Positions so prepared suffer very little from gun-fire, and will frequently require attack by systematic approaches. ”
Source: Gutenberg

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