This is the 9284th most frequent Russian word.
сталинградской
"Stalingrad" or "of Stalingrad" (relating to the city or the Battle of Stalingrad).
The word "Сталинградской" here is a proper adjective describing the noun "битвы" (battle), referring to the famous historical event known as the Battle of Stalingrad.
Музей Сталинградской битвы находится в Волгограде.
The Museum of the Battle of Stalingrad is located in Volgograd.
In this sentence, "Сталинградской" is used to qualify "победе" (victory), attributing the victory to the city of Stalingrad.
Сталинградской победе посвящена эта памятная монета.
This commemorative coin is dedicated to the Stalingrad victory.
Here, "Сталинградской" modifies "стратегии" (strategy), indicating a characteristic related to Stalingrad or its historical context.