 Complete the following phrase:  The M1888 gun was a coastal artillery gun initially deployed as part of the Endicott system of fortifications. The first nine were deployed on the M1892 barbette carriage in 1898, but the improved M1894 and M1896 disappearing carriages soon became available, and approximately 64 additional weapons were deployed on these carriages by 1908. An emergency converted Rodman carriage was also used during the SpanishAmerican War in 1898 to quickly arm 21 emplacements with the modern 8-inch M1888 gun. These weapons were redeployed soon after the war ended. The disappearing carriage allowed the gun to remain behind a parapet resembling a hillside most of the time, thus largely invulnerable to low-angle enemy fire, which was the only type of enemy attack anticipated 18981910. Air and high-angle artillery attack would eventually severely impact US fortifications in the 