08/26/2026
“What is it” Wednesday!
A follow-up post to our “Panama Mounts” from last week- this week, we share the artillery piece that sat atop them!
This M1917A1 155-mm Gun on Carriage M1918 is a true piece of Coast Artillery history. Initially acquired by the United States from the government of France during WWI, the United States developed the carriage for the French built tubes. Want a fun fact to stump your friends (coast artillery buffs excluded!)? The French built tubes are designated M1917, but guns equipped with the American-made Breech Mechanism are designated M1917A1 (like ours!).
Another interesting fact? The carriage for our 155-mm currently on display was manufactured by Dodge Brothers (the American automaker) in 1940! Our carriage is of the M1918 type as displayed (solid wheels with rubber road tires and no electric brakes). Modifications to this carriage would bring pneumatic road tires and electric/ air brakes, though it seems likely that the guns at Fort Miles did not receive these modifications.
155-mm guns were staples of the Coast Artillery. They were mobile, boasted a decent effective range of over 11 miles, and packed a punch: the projectile weighs in at 95lbs and leaves the barrel at more than 2400 feet per second!
Eight of these guns would be assigned to Fort Miles in WWII. Four 155-mm guns were placed with Battery C, 261st Coast Artillery Battalion (Separate) at Cape Henlopen, DE and four with Battery C, 21st Coast Artillery Regiment at Cape May, NJ. Although initially in sand for training completed in October of 1941 (see photo 2) all eight guns eventually had semi-permanent “Panama Mounts” constructed in 1942; photo 3 is believed to be at one such emplacement at Fort Miles.
Stop by the Fort Miles Museum and Historic Area any time Cape Henlopen State Park is open to see our example 155-mm or any of the other artillery currently display in the Artillery Park!
Photo 1: Fort Miles Museum and Historic Area’s M1917A1 155-mm Gun on Carriage M1918, February 2026
Photo 2: 155-mm guns at Fort Miles, circa 1941
Photo 3: 155-mm gun drill at Fort Miles, circa 1942