"Since the invention of gunpowder, fortification has received various improvements, and many have been the books wrote upon this subject, which might incline one to think, that it was arrived to its utmost perfection. . . "
"This 1944 manual prescribes the knowledge and skill required to serve effectively the multiple gun motor carriages M15 and M15A1. Variations in assigned materiel may necessitate changes in the prescribed drill."