The guns for this improvised use were obtained as follows:
From the Coast Artillery, a branch of the Army, we obtained ninety-five 6-inch guns, 50 calibers in length, and twenty-eight 5-inch guns, 44.6 calibers; from the Navy stores came forty-six 6-inch guns, ranging from 30 to 50 calibers in length; from Francis Bannerman & Son, thirty 6-inch guns, 30 calibers long. This was a total of 199 weapons of great destructive power, awaiting only suitable mobile mounts to make them of valiant service on the western front. It was the task of the Ordnance Department to take these guns and as swiftly as possible mount them on field artillery carriages of an improvised type that could be most quickly built.
Minor changes had to be made on many of the guns obtained in this manner in order to adapt them for use on field artillery carriages. The various seacoast guns were retained as they were in length, because it was planned to return them eventually to the fortifications from which they had been taken. The Navy guns, all of the 6-inch size, were shipped to the Watervliet Arsenal to be cut down to a uniform length of 30 calibers.
The need for speed in manufacture demanded that the carriages for these guns should be of the simplest design consistent with the ruggedness required for field operations and the accuracy necessary for effectiveness. When tests of the first carriages produced were made it was found that requirements had been more than met.
Orders were placed on September 24, 1917, with the Morgan Engineering Co., of Alliance, Ohio, for 70 mounts for the 6-inch units. A few days later this number was increased to 74, while on the 28th of September, 1917, the same company was given an order for 18 additional 6-inch gun mounts and 28 mounts for the 5-inch guns. Orders for limbers were placed with the same company on December 1.
It was soon discovered that big transport wagons would be required to carry the long 6-inch seacoast guns separately because of their great weight. On February 15, 1918, the Morgan Engineering Co. was ordered to build these necessary transport wagons.
Difficulties in securing skilled labor, necessary materials, and tools delayed production of these mounts, but the eighteen 6-inch gun mounts ordered September 28, 1917, were completed in March, 1918, while the twenty-eight 5-inch gun mounts ordered on the same date were finished in April. In August, 1918, the seventy-four 6-inch gun mounts were turned out. The production of an additional order for thirty-seven 6-inch gun mounts was just beginning when the armistice was signed.
The 6-inch gun carriage, bearing the gun, weighs about 41,000 pounds. A maximum range of over 10 miles can be obtained by this weapon. The complete 5-inch gun unit weighs about 23,500 pounds and has a maximum range of more than 9 miles. In understanding the difficulties that faced the Ordnance Department in building carriages for these guns, it should be recalled that these big weapons were originally built for fixed-emplacement duty and were therefore much heavier than mobile types. This fact complicated the problem of designing the wheeled mounts. They proved to be more difficult to maneuver than the lighter types of guns.
| Model. | Size. | Number ordered. | Number completed prior to Nov. 11. | Number floated for overseas. |
|---|---|---|---|---|
| 1897 | 5-inch | 28 | 28 | 26 |
| 1917 | 6-inch | 74 | 74 | 68 |
| 1917-A | 6-inch | 18 | 18 | 4 |
| 1917-B | 6-inch | 37 | 1 |