The second 16-inch battery in the 1936 plans for the defense of San Diego Harbor was located on Coronado Heights along with Batteries Grant and Imperial. Work began in March 1943. The gun emplacements and casemates were completed along with the ground-covered concrete plotting and switchboard rooms north of the battery and its magazines when the work was suspended in February 1944. As with Construction 129 in the Bay Area, the threat from Japanese Naval attack had ended by then so there was no need to finish the project. The guns were never mounted at Construction No. 134.
