There were 23 batteries installed on Corregidor, consisting of 56 coastal guns and mortars. Battery Way, named in honor of 2nd Lt. Henry N. Way, 4th U.S. Artillery, who died in service in the Philippines in 1900, is said to be the most intact of Corregidor's artillery batteries. Construction for this battery began in 1904 and was completed in 1914 at a total cost of $112,969.
Its four 12-inch (305mm) M1890 mortar carriages, capable of a 360-degree traverse, could fire on land targets at Bataan. These mortars were manned by a crew of fourteen. Firing sequence was done to two of the mortars at a time to achieve a salvo effect.
The back of the postcard reads:
Giant 12-inch mortar, biggest ever built, weighs 25 tons and could shoot a 670 lb. projectile. The relics are still to be seen on the "Rock".
Corregidor Wikipedia Entry
Battery Way Wikipedia Entry
Corregidor Island: Battery Way