[citation needed] The gun was also manufactured in the United States from 1917, after the US switched to metric artillery based on French patterns.

Some of the guns were originally emplaced in "Panama mounts" on Corregidor, Caballo and Carabao islands at the entrance of Manila Bay.

During the Second World War, some US-made guns were used for coast defense of US and Allied territories, such as Australia and Bermuda, typically on "Panama" mountings - circular concrete platforms with a raised centre section, with the carriage tires pivoting around the center section and the split trails spread out on rails at the edge of the platform.

[2] This gun was designed by Colonel L. J. F. Filloux to fill a vital French Army requirement for a heavy artillery piece.

The design proved a success and became the standard heavy field gun of the French from 1917 to the end of World War I.

[4] During the First World War, the gun was eventually taken on by the American Expeditionary Force as a standard long-range artillery piece.

During the Second World War the 155 mm guns were taken out of storage and used for coast defense on American shores and in Allied territories such as the Philippines and Australia.