In January and February 1944, Stalin’s “broad front” strategy takes hold and the Red Army gains the momentum in the war on the Eastern Front.
Map 1: The Korsun-Cherkassy Pocket

Map 2: The Advance on Narva

Map 3: The Battle of Narva and Lake Peipus

Map 4: The Panther Line

Map 5: The breakout to Lysyanka

Map 6a: The Eastern Front 15 January 1944

Map 6b: The Eastern Front 15 February 1944

Image 1: Ivan S. Konev, commander of the 2nd Ukrainian Front

Image 2: Nikolai Vatutin, commander of the 1st Ukrainian Front

Sources
Antony Beevor, The Second World War. London, UK: Little, Brown and Co., 2012.
Evan Mawdsley, Thunder in the East: The Nazi-Soviet War, 1941–1945. London: Bloomsbury Academic, 2016.
Orest Subtelny, Ukraine: A History. Toronto: University of Toronto Press, 1988.
Anthony Tucker-Jones, Slaughter on the Eastern Front: Hitler and Stalin’s War 1941–1945. Stroud, Gloucestershire, UK: The History Press, 2017.
Wikipedia, various pages.