Kontreadmiral Wilhelm Souchon

Yavuz Sultan Selim (FF), ex SMS Goeben
   Kapitän zur See Ackerman

Medillii, ex SMS Breaslau
   Fregattenkapitän Kettner
 

Gunnery Note

Yavuz fired nineteen 28 cm projectiles at ranges between 6,000 to 7,200 m.  No secondary ammunition was fired nor did Medillii fire as the Russian fleet was outside their range.

Damage Note

Yavuz struck by a 12-inch HE from Evstafi on Port No. 3 15 cm casemate, which penetrated casemate armor but broke up.  Three 15 cm projectiles detonated - this is the only time during the entire war that German projectiles exploded as a result of an artillery hit - and sixteen 15 cm cartridges of the ready ammunition burned.  Twelve men died immediately and a Turkish sailor later died from gas poisoning.

Russian Forces

Black Sea Fleet
    Admiral Andrei Eberhard

Cruiser Screen
   Rear Admiral Pokrov

Pamiat Merkuria (F)
Kagul
Almaz   Captain 1st Rank Zarin

Main Body
Battleship Division
   Vice Admiral Novitsky

Evstafi (FF)   Captain 1st Rank Galanin
Ioann Zlatoust   Captain 1st Rank F.A. Winter
Panteleimon (F)   Captain 1st Rank Kaskov

2nd Battleship Brigade
   Rear Admiral Putyatin

Tri Sviatitelia (F)   Captain 1st Rank Lukin
Rostislav   Captain 1st Rank Porembsky

1st, 2nd and 3rd Destroyer Divisions
   Captain 1st Rank Sablin

Derzki Class Destroyers (3)
Old Destroyers (10)

Minelayers

Konstantin
Kseniya
 

Gunnery Note

Evstafi fired sixteen 12-inch, fourteen 8-inch and nineteen 6-inch.
Ioann Zlatoust fired six 12-inch.
Panteleimon did not shoot.
Tri Sviatitelia fired twelve 12-inch.
Rostislav fired an unknown quantity of shells at Medillii.

Damage Note

Evstafi was hit by three 28 cm APC.  First on the starboard forward casemate, killing the gun crew.  Second on the casemate armor at approximately frame 54, piercing the 127 mm armor and striking 6-inch shells and cartridges, setting some of the latter on fire.  Shell exploded in the officers gallery and did great damage with splinters penetrating the the deck above and some penetrating down into the boiler room.  The third shell fell short of the ship on or near the waterline at frame 22 and riddled the hull in this area, destroying a longitudinal bulkhead and part of the elevator for the 75 mm gun ammunition.  Four officers and twenty-nine crew died immediately.  One other officer died later from his injuries and twenty-four crewmen were wounded, nineteen badly of whom the majority later died.
 

Source:  "Battle on the Seven Seas:  German Cruiser Battles 1914 - 1918" by Gary Staff