Question: How many naval guns did these battleships carry, in which the Japanese aircraft carrier Shinano was the third of these battleships?
Sentence (from "Japanese aircraft carrier Shinano"): Laid down in May 1940 as the third of the "Yamato"-class battleship s, "Shinano"' s partially complete hull was ordered to be converted to a carrier following Japan's disastrous loss of four fleet carriers at the Battle of Midway in mid-1942.
Relevant evidence: Yes