Up to December 12, 1918, a total of 381 carriages of the 4.7-inch type had been completed and delivered. These carriages included the recoil mechanism. In the month of October, 1918, alone, 113 were produced, and this rate would have been continued had the armistice not been signed. Cannon for the 4.7-inch units were turned out at the Watervliet Arsenal and the Northwestern Ordnance Co., Madison, Wis. Deliveries from the Watervliet Arsenal began in June, 1918, totaling 120 up to December, while the Northwestern Ordnance Co., starting its deliveries in August, had completed 98 by December. Up to the 15th of November, 64 complete 4.7-inch units had been floated for our forces overseas. Forgings for the 4.7-inch gun cannon were made by the Bethlehem Steel Co. and the Heppenstall Forge & Knife Co., of Pittsburgh, Pa. Owing to the great difference in cross section between muzzle and breech end of the jacket, great difficulty was experienced in the heat treatment of these forgings, particularly on the part of manufacturers who had had no previous experience in the production of gun forgings. [Illustration: FRONT AND REAR VIEWS OF OUR 4.7-INCH GUN AND CARRIAGE, MODEL 1906, WITH WHICH OUR TROOPS HAVE BEEN EQUIPPED FOR A LONG TIME. This gun throws a projectile weighing 45 pounds a distance of about 6 miles.] [Illustration: TWO VIEWS OF 155-MILLIMETER GUN, MODEL 1918, G. P. F. The upper view shows the piece mounted on an auto truck for quick moving about.] In order to produce enough forgings to supply the finish-machining shops, an order for 50 jackets was later given to the Edgewater Steel Co., of Pittsburgh, Pa., where the jackets were forged. These were then sent to the Heppenstall Forge & Knife Co. for rough machining and finally returned to the Edgewater Steel Co. for heat treating. An order for 150 jackets was also given to the Tacony Ordnance Corporation. Shortly before the signing of the armistice, the jacket was redesigned so that the heavy breech end was forged separately in the shape of a breech ring. This design, however, was not produced. It was desired to develop a 4.7-inch gun carriage having the characteristics of the split-trail 75-millimeter gun carriage, model of 1916, so that greater elevation and wide traverse could be obtained. The Bethlehem Steel Co. was given a small order for 36 carriages of their own design prior to the war, and their pilot carriage had been undergoing tests at the proving ground. The design was, however, not sufficiently advanced to be used in the war.