FM 6-81 155-mm Howitzer M1 Field Manual

Focusing on the design and operational history, the 155-mm Howitzer M1 was developed during World War II as a medium artillery piece, replacing the outdated M1918. Its unique slow-cone interrupted screw mechanism required two movements to open the breech, distinguishing it from contemporaries. This field manual, originally restricted and now declassified, provides comprehensive insights into the howitzer's assembly, maintenance, and accessories, ensuring that the essential details of this significant artillery piece are preserved for current and future military personnel.