Service
The M1 equipped 16 or 17 field artillery battalions in the Northwest Europe, where it was employed for corps support. M5 High Speed Tractor was assigned as prime mover. The weapon was declared obsolete in September 1945.
The gun had good range, nearly five km longer than its 155 mm howitzer sibling and longer than the 155 mm Gun M1918MI. It was out-ranged by another 155 mm gun, the Long Tom, but the latter was nearly three times heavier.
On the other side, the 4.5 inch gun was criticized for insufficient power of its high explosive shell. The shell was produced from low grade ("19 ton") steel, which necessitated thick walls. As a result, it carried only about two kg of TNT or substitute, in fact less than the 105 mm high explosive shell. Additionally, it was felt that having a small number of guns of atypical caliber unnecessarily complicated logistics.
Read more about this topic: 4.5 Inch Gun M1
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