The Battle of Savo Island was part of Guadalcanal Campaign and was fought on 9 August 1942 in the waters around Savo Island by forces of the Imperial Japanese Navy (IJN) and Allies' Guadalcanal—Tulagi invasion force composed of ships from the United States Navy (USN) and Royal Australian Navy (RAN). The battle resulted in a major Allied defeat, losing four heavy cruisers. The Japanese lost no ships but failed to capitalize on the temporary strategic advantage gained from the battle, leaving the unprotected Allied transports unharmed.
Because the Japanese had the tactical initiative, their forces are listed first.
Japanese order of battle.
Striking Force.
Vice Admiral Gunichi Mikawa in heavy cruiser "Chokai"
 8th Fleet
 1 heavy cruiser
 1 : (damaged) 
 Top speed: 34.25 knots
 Main battery: 10 × 8-inch 
 Secondary btty.: 8 × 5-inch
 Anti-aircraft btty.: 8 × 25mm, 4 × 13mm 
 Torpedo tubes: 16 × 24-inch
 1 destroyer
 1 : 
 Top speed: 37.25 knots
 Main battery: 4 × 4.7-inch 
 Anti-aircraft btty.: 2 × 7.7mm 
 Torpedo tubes: 6 × 21-inch
 Cruiser Division 6
 Rear Admiral Aritomo Gotō in heavy cruiser "Aoba"
 4 heavy cruisers
 2 : ', ' (sunk by a submarine near Rabaul on 10 August)
 2 : ', ' (damaged)
 Top speed: 33 knots
 Main battery: 6 × 8-inch 
 Secondary btty.: 4 × 4.7-inch
 Anti-aircraft btty.: 8 × 25mm, 4 × 13mm 
 Torpedo tubes: 8 × 24-inch 
 Cruiser Division 18
 Rear Admiral Mitsuharu Matsuyama in light cruiser "Tenryū"
 2 light cruisers
 1 : (damaged)
 Top speed: 33 knots
 Main battery: 4 × 5.5-inch 
 Anti-aircraft btty.: 1 × 3-inch, 2 × 13mm 
 Torpedo tubes: 6 × 21-inch 
 1 "Yūbari"-class light cruiser: 
 Top speed: 35.5 knots
 Main battery: 6 × 5.5-inch 
 Anti-aircraft btty.: 1 × 3-inch, 2 × 13mm 
 Torpedo tubes: 4 × 24-inch
Allied order of battle.
Task Group 62.6.
Rear Admiral Victor Crutchley (RN) in heavy cruiser "Australia"
Southern Force
Captain Howard D. Bode (USN) in heavy cruiser "Chicago"
 3 heavy cruisers
 2 / "Kent"-subclass: ', ' (damaged and scuttled)
 Top speed: 31.5 knots
 Main battery: 8 × 8-inch guns
 Secondary btty.: 8 × 4-inch
 Anti-aircraft btty.: 8 × 2-pounder, 8 × 50-cal.
 Torpedo tubes: 8 × 21-inch
 1 : (damaged)
 Top speed: 32.7 knots
 Main battery: 9 × 8-inch guns
 Secondary btty.: 8 × 5-inch/25-cal. dual-purpose
 2 destroyers
 2 destroyers: ', ' (damaged)
 Top speed: 36.5 knots
 Main battery: 4 × 5-inch/38-cal.
 Anti-aircraft btty.: 4 × 1.1-inch
 Torpedo tubes: 16 × 21-inch
Northern Force
Captain Frederick L. Riefkohl (USN) in heavy cruiser "Vincennes"
 3 heavy cruisers
 All : ' (sunk), ' (sunk), (sunk)
 Top speed: 32.7 knots
 Main battery: 9 × 8-inch guns
 Secondary btty.: 8 × 5-inch/25-cal. dual-purpose
 2 destroyers
 1 : 
 1 : 
 Top speed: 36.5 knots
 Main battery: 4 × 5-inch/38-cal.
 Anti-aircraft btty.: 4 × 1.1-inch
 Torpedo tubes: 16 × 21-inch
References.
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