After the start of the war, each of the vessels in the Nagara-class was modified and upgraded, especially to enhance anti-aircraft capabilities, but no two vessels were modified in the same way. By the year 1943-1944, the five surviving ships in the class received radar. | After the start of the war, each of the vessels in the Nagara-class was modified and upgraded, especially to enhance anti-aircraft capabilities, but no two vessels were modified in the same way. By the year 1943-1944, the five surviving ships in the class received radar. |