War of the Rats by David L. Robbins

In the ruins of Stalingrad, 1942, two master snipers face each other in a deadly contest that mirrors the larger war raging around them. Vasily Zaitsev, a young Russian sharpshooter turned national hero, becomes the symbol of Soviet resistance. Across the devastated city, Major Konig, an expert marksman from the German army, is sent to hunt him down. Amid the cold, hunger, and horror, their duel unfolds in a landscape of shattered buildings and broken lives. War of the Rats captures the brutal intensity of combat and the human endurance that burns even in the heart of ruin.