- World War Two
- Imperial Japanese Navy (IJN)
- 1st Nagara-class light cruiser (Total 6), named after the Nagara River in the Chūbu region, Japan.
- Battle of Shanghai & Hainan Island Operation (1939) - with Myōkō and Nachi
- Invasion of French Indochina (30 January 1941 ~ 8 April 1941)
- Invasion of the Philippines and Dutch East Indies (10 September 1941 ~ 29 March 1942)
- Battle of Midway (4 June 1942 ~ 13 June 1942) - with aircraft carriers Akagi, Kaga, Sōryū, Hiryū; battleships Haruna & Kirishima; cruisers Tone & Chikuma.
- Battle of the Solomon Islands (14 July 1942 ~ 20 November 1942)
- refit at Maizuru (end of 1942) - No.5 14cm gun was removed.
- refit at Maizuru (July 1943) - a Type 21 air-search radar & 4 x twin-mount Type 96 25mm AA guns were fitted.
- Operations in the South Pacific (1943)
- refit at Maizuru (26 January 1944) - No. 7 14cm gun was removed & replaced by a 127mm unshielded HA gun. The fore and aft twin torpedo tubes were removed & replaced by 2 x quadruple mounts aft. The aircraft catapult was removed & replaced by 2 x triple-mount Type 96 25mm AA guns [Total 22 x 25mm total (2x3, 6x2, 4x1)]. Depth charge rails were installed & a Type 93 hydrophone set was fitted.
- refit at Yokosuka (2 July 1944) - 10 x single mount Type 96 25mm AA guns were installed [Total 32 barrels (2X3, 6x2, 14x1)]. A Type 22 surface-search radar was fitted.
- Nagara was hit by a torpedoe from submarine USS Croaker and sank off Amakusa Islands, East China Sea on 7 August 1944
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