
1) City of Asia 2) City of Japan 3) City in Asia 4) City in Japan 
Found on 
https://www.crosswordclues.com/clue/kasuga

 ==Ships== ==People with the surname== ...
Found on 
http://en.wikipedia.org/wiki/Kasuga

The Kasuga (formerly the Mitra) was an Argentine-built Japanese coastal defence ship of 7080 tons displacement launched in 1902 and purchased by the Japanese navy in 1904. The Kasuga was powered by twelve Kanpon coal-fired boilers providing a top speed of 20 knots when launched and carried a complement of 595. She was variously armed with one 10 in...
Found on 
http://www.probertencyclopaedia.com/browse/RK.HTM
  No exact match found.