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In July 1943, the German army launched a large-scale offensive in the Kursk region to attack a salient in the Soviet lines. Germany aimed to encircle Soviet forces in the area and regain the initiative on the Eastern Front. However, the Soviets had anticipated Germany's attack plan and established multiple layers of defense and minefields. Despite concentrating their tanks and mechanized units, the German forces were unable to advance quickly due to the strong defenses. A massive tank battle took place around Prokhorovka, inflicting significant casualties on both sides. Ultimately, the German army halted its offensive, and the Soviet forces immediately launched a counterattack. Subsequently, the Soviet army recaptured key areas such as Oryol and Kharkiv, advancing westward. The Battle of Kursk was one of Germany's last major attempts to regain strategic initiative on the Eastern Front. After this, the German army gradually focused on defense, and the Soviet army laid the foundation for continued westward advances until the end of the war.

Victorious in North Africa, the Allies began their assault on Italy via the Mediterranean. In July 1943, Allied forces landed on the island of Sicily and, overcoming Italian resistance, secured the island. As public discontent with the war grew, Mussolini was ousted, and the new Italian government secretly negotiated an armistice with the Allies. When the Italian government announced the armistice with the Allies in September 1943, German forces immediately occupied northern and central Italy and established defensive lines. The Germans exploited the rugged terrain of the Italian peninsula to slow the Allied advance. The Allies engaged in fierce battles, notably at Monte Cassino, as they pushed northward. Italy was divided into German-occupied and Allied-occupied zones, and Mussolini, with German support, established a puppet regime in the north. The Italian front continued until the end of the war, becoming a crucial theater that forced Germany to commit additional troops and resources.

In North Africa, the German Afrika Korps and British forces continued to clash over Egypt and Libya. By mid-1942, Rommel's German forces had advanced deep into Egypt, threatening the Suez Canal. However, the British forces strengthened their defenses under the command of Bernard Montgomery. In the Second Battle of El Alamein, which began in October 1942, the British forces concentrated their artillery and tanks to attack the German and Italian armies. The Allies exploited the German army's supply problems, gradually pushing the front line westward, and Rommel's forces retreated towards Libya. Meanwhile, in November 1942, US and British forces launched Operation Torch, landing in western North Africa. German and Italian forces came under pressure from both east and west, eventually being pushed back to Tunisia. In May 1943, the Axis forces in North Africa surrendered, ending the fighting in the region. The Allies secured a foothold for advancing into Southern Europe via the Mediterranean.

In 1942, Germany launched a new major offensive in southern Soviet territory. The German objective was to secure the oil resources of the Caucasus region and control the Volga River's transport routes. Stalingrad became a crucial target in this process. Although German forces captured most of the city, Soviet troops fiercely resisted, focusing their defense within the urban areas. In November 1942, Soviet forces attacked both flanks of the German army, encircling the German 6th Army that had advanced into Stalingrad. The German army was ordered to hold the city rather than retreat, but they gradually lost combat effectiveness due to supply shortages and the harsh winter. The battle concluded in February 1943 with the surrender of the remaining German 6th Army forces. Both sides suffered immense losses in troops and equipment during the Battle of Stalingrad, marking a significant strategic defeat for Germany on the Eastern Front. Subsequently, Soviet forces began to advance westward, pushing back the German army. The Battle of Stalingrad is recorded as a pivotal turning point that changed the course of the European war.

Following the Battle of Midway, the United States landed troops on Guadalcanal Island to prevent Japanese expansion into the South Pacific. The Battle of Guadalcanal, which began in August 1942, escalated into a fierce engagement involving the Army, Navy, and Air Force. The Japanese military deployed forces multiple times to recapture the island, but the US forces maintained their defensive lines with naval and air support. Several naval battles also occurred around Guadalcanal, inflicting heavy casualties on both sides. The Japanese forces struggled to supply sufficient troops and materials due to long supply lines, and eventually withdrew from the island in February 1943. The Battle of Guadalcanal was a significant instance marking the beginning of the US's full-scale counteroffensive in the Pacific. Subsequently, the US military advanced towards the Japanese mainland by securing islands one by one. During this process, naval power, air power, and amphibious assault capabilities greatly developed. Japan began to be pushed into a defensive stance, and the initiative in the Pacific War clearly shifted further to the United States.

In June 1942, the Battle of Midway occurred, altering the course of the Pacific War. Japan aimed to lure and destroy American aircraft carriers, further strengthening their dominance in the Pacific. However, the US had intercepted Japanese communications, understood their attack plan, and prepared defenses in advance. When the battle began, dive bombers launched from American carriers attacked Japanese carriers, resulting in Japan losing four of its main aircraft carriers in a single day. While the US also lost aircraft and personnel, they succeeded in significantly weakening the Japanese Navy's skilled pilots and carrier force. The Battle of Midway became a crucial turning point, shifting the momentum from Japan's unilateral offensive in the Pacific. Following this, the US prepared to counterattack, aiming to retake the territories Japan had occupied. Although Japan still possessed a formidable naval force, it became difficult for them to expand their territory at the same pace as in the early stages of the war. The initiative in the Pacific War gradually began to shift towards the United States.

Following the attack on Pearl Harbor, the Japanese military launched large-scale offensives across Southeast Asia and the Pacific. Japan attacked various regions including the Philippines, the Malay Peninsula, Hong Kong, and the Dutch East Indies, rapidly capturing parts of the colonies belonging to Britain, the United States, and the Netherlands. Japan considered these areas important because they needed to secure resources essential for the war, such as oil, rubber, and tin. In the Philippines, US and Filipino forces resisted fiercely, but Bataan Peninsula and Corregidor eventually fell. On the Malay Peninsula, the Japanese army advanced more quickly than anticipated, and Singapore, a key British naval base, surrendered in February 1942. In a short period, Japan seized a vast area in Southeast Asia and the Western Pacific. However, as the Japanese military's front lines became excessively stretched, new problems arose in supply and defense. The United States began preparing a counteroffensive in the Pacific centered around its aircraft carriers, and Japan's expansion gradually started to hit its limits.

Although the United States maintained neutrality in the early stages of the war, it provided supplies and weapons to countries like Britain and China. As Japan expanded its invasion of China, economic conflicts with the US intensified, leading to US restrictions on oil and raw material exports. The Japanese leadership concluded that war with the United States was unavoidable and devised a plan to simultaneously attack key bases in the Pacific. On December 7, 1941, Japanese forces launched a surprise attack on the US Pacific Fleet stationed at Pearl Harbor, Hawaii. The US suffered significant damage to battleships and aircraft, though aircraft carriers were not present in Pearl Harbor at the time. The following day, the US declared war on Japan, and Germany and Italy also declared war on the US, escalating the conflict into a full-blown world war. Leveraging its immense industrial capacity, the US began mass production of munitions and warships. In the Pacific, Japanese forces seized vast territories in their initial offensive, but the US rapidly established its war-fighting capabilities. The attack on Pearl Harbor became the decisive event that led to America's full-scale entry into the war.

Germany and the Soviet Union signed the Molotov-Ribbentrop Pact in 1939, but tensions between the two nations persisted. Hitler pursued a plan to dominate Eastern Europe and secure Soviet territory and resources. On June 22, 1941, Germany launched Operation Barbarossa, a surprise invasion of the Soviet Union. German forces deployed large numbers in three directions—north, central, and south—inflicting heavy casualties on the Red Army and advancing rapidly in the initial stages. Although the Soviets lost significant troops and equipment, they relocated factories and supplies eastward during their retreat. The German army pushed towards Leningrad, Moscow, and Ukraine, but gradually faced difficulties due to the vast territory and long supply lines. The Soviet Union continuously replenished its forces, and as winter approached, the pace of the German advance slowed. The Soviet counterattack in the Battle of Moscow at the end of 1941 marked the failure of Germany's blitzkrieg strategy. The invasion of the Soviet Union became the largest front in the European war, demanding immense manpower and resources from Germany.

World War II unfolded beyond Europe into North Africa. Italy declared war on Britain and France in June 1940, joining the conflict on Germany's side. The Italian forces, based in Libya, advanced towards Egypt, then under British control, but encountered stronger resistance than anticipated. The British forces launched a counteroffensive, pushing the Italian army deep into Libya. Germany dispatched the Afrika Korps, led by Erwin Rommel, to support Italy. Rommel utilized mobile warfare to push back the British forces again, emerging as a key commander on the North African front. This region was considered a strategic vital point, connecting the Suez Canal with the oil resources of the Middle East, making it crucial for both sides. The North African campaign became a major front where German and British forces directly clashed, leading to repeated offensives and counteroffensives. The war was gradually expanding beyond the European continent into the Mediterranean and Africa.