Encirclement in the context of "Second island chain"

The German Army (German: Heer, German: [heːɐ̯] ; lit. 'army') was the land forces component of the Wehrmacht, the regular armed forces of Nazi Germany, from 1935 until it effectively ceased to exist in 1945 and then was formally dissolved in August 1946. During World War II, a total of about 13.6 million volunteers and conscripts served in the German Army.

Only 17 months after Adolf Hitler announced the German rearmament programme in 1935, the army reached its projected goal of 36 divisions. During the autumn of 1937, two more corps were formed. In 1938 four additional corps were formed with the inclusion of the five divisions of the Austrian Army after the annexation of Austria by Germany in March. During the period of its expansion under Hitler, the German Army continued to develop concepts pioneered during World War I, combining ground and air units into combined arms forces. Coupled with operational and tactical methods such as encirclements and "battle of annihilation", the German military managed quick victories in the two initial years of World War II, a new style of warfare described as Blitzkrieg (lightning war) for its speed and destructive power.

Blitzkrieg (Lightning/Flash Warfare) is a word used to describe a combined arms surprise attack, using a rapid, overwhelming force concentration that may consist of armored and motorized or mechanized infantry formations, together with artillery, air assault, and close air support. The intent is to break through an opponent's lines of defense, dislocate the defenders, confuse the enemy by making it difficult to respond to the continuously changing front, and defeat them in a decisive Vernichtungsschlacht: a battle of annihilation.

During the interwar period, aircraft and tank technologies matured and were combined with the systematic application of the traditional German tactic of Bewegungskrieg (maneuver warfare), involving the deep penetrations and the bypassing of enemy strong points to encircle and destroy opposing forces in a Kesselschlacht (cauldron battle/battle of encirclement). During the invasion of Poland, Western journalists adopted the term blitzkrieg to describe that form of armored warfare. The term had appeared in 1935, in the German military periodical Deutsche Wehr ("German Defence"), in connection to quick or lightning warfare.

During World War II, Soviet prisoners of war (POWs) held by Nazi Germany and primarily in the custody of the German Army were starved and subjected to deadly conditions. Of nearly six million who were captured, around three million died during their imprisonment.

In June 1941, Germany and its allies invaded the Soviet Union and carried out a war of extermination with complete disregard for the laws and customs of war. Among the criminal orders issued before the invasion was for the execution of captured Soviet commissars. Although Germany largely upheld its obligations under the Geneva Convention with prisoners of war of other nationalities, military planners decided to breach it with the Soviet prisoners. By the end of 1941, over 3 million Soviet soldiers had been captured, mostly in large-scale encirclement operations during the German Army's rapid advance. Two-thirds of them had died from starvation, exposure, and disease by early 1942. This is one of the highest sustained death rates for any mass atrocity in history.

The first Battle of Smolensk (German: Kesselschlacht bei Smolensk, lit. 'Cauldron-battle at Smolensk'; Russian: Смоленская стратегическая оборонительная операция, romanized: Smolenskaya strategicheskaya oboronitelnaya operatsiya, lit. 'Smolensk strategic defensive operation') was a battle during the second phase of Operation Barbarossa, the Axis invasion of the Soviet Union, in World War II. It was fought around the city of Smolensk between 10 July and 10 September 1941, about 400 km (250 mi) west of Moscow. The Ostheer had advanced 500 km (310 mi) into the USSR in the 18 days after the invasion on 22 June 1941.

The Soviet 16th, 19th and the 20th armies were encircled and destroyed just to the east of Smolensk, though many of the men from the 19th and 20th armies managed to escape the pocket. While the battle was a stunning operational success for the Germans, the rapid advances into Soviet territory led to supply and logistics crises of increasing severity, as German supply lines were stretched to their limit.

The Battle of the Bulge, also known as the Ardennes Offensive or Unternehmen Wacht am Rhein, was the last major German offensive campaign on the Western Front during the Second World War, taking place from 16 December 1944 to 25 January 1945. It was launched through the densely forested Ardennes region of eastern Belgium and northern Luxembourg. The offensive was intended to stop Allied use of the Belgian port of Antwerp and to split the Allied lines, allowing the Germans to encircle and destroy each of the four Allied armies and force the western Allies to negotiate a peace treaty in the Axis powers' favor.

The Germans achieved a total surprise attack on the morning of 16 December 1944, due to a combination of Allied overconfidence based on the favorable defensive terrain and faulty intelligence about Wehrmacht intentions, poor aerial reconnaissance due to bad weather, and a preoccupation with Allied offensive plans elsewhere. American forces were using this region primarily as a rest area for the U.S. First Army, and the lines were thinly held by fatigued troops and inexperienced replacement units. The Germans also took advantage of heavily overcast weather conditions that grounded the Allies' superior air forces for an extended period. American resistance on the northern shoulder of the offensive, around Elsenborn Ridge, and in the south, around Bastogne, blocked German access to key roads to the northwest and west which they had counted on for success. This congestion and terrain that favored the defenders threw the German advance behind schedule and allowed the Allies to reinforce the thinly placed troops. The farthest west the offensive reached was the village of Foy-Notre-Dame, south east of Dinant, being stopped by the U.S. 2nd Armored Division on 24 December 1944. Improved weather conditions from around 24 December permitted air attacks on German forces and supply lines. On 26 December the lead element of General George S. Patton's U.S. Third Army reached Bastogne from the south ending the siege. Although the offensive was effectively broken by 27 December, when the trapped units of 2nd Panzer Division made two break-out attempts with only partial success, the battle continued for another month before the front line was effectively restored to its position prior to the attack.