= 400 mm artillery
{wiki=Category:400_mm_artillery}
400 mm artillery refers to heavy artillery pieces that have a caliber of 400 millimeters (mm), which is approximately 15.75 inches. This type of artillery is typically used for long-range bombardment and can deliver a significant explosive payload over great distances. The use of 400 mm artillery is primarily associated with large siege guns, coastal defense weapons, or heavy artillery systems designed to provide support against fortified positions or to engage enemy forces at long ranges.
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