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Line of Contact

Line of Contact is a mathematics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Line of Contact rather than just read about it. In short: The Line of Contact marked the farthest advance of American, British, French, and Soviet armies into German controlled territory at the end of World War II in Europe. In general a "line of contact" refers to the demarcation between two or more given armies, whether they are allied or belligerent.

Line of Contact — main illustration
Line of Contact — illustration

Key takeaways

  • Line of Contact belongs to mathematics; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Line of Contact to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Line of Contact from memory before moving on to harder problems.

Reference excerpt

The Line of Contact marked the farthest advance of American, British, French, and Soviet armies into German controlled territory at the end of World War II in Europe. In general a "line of contact" refers to the demarcation between two or more given armies, whether they are allied or belligerent.

The first contacts were made by the US 273rd Infantry Regiment, 69th Infantry Division and Soviet 58th Guards Rifle Division. The first visual contact occurred at 11:30 am, April 25, in the village of Leckwitz, when First Lieutenant Arnold Kotzebue, from the 69th Infantry Division, saw a horseman, named Aitkali Alibekov, riding into the courtyard of one of the houses on the central street. The patrol was on the west bank of the Elbe at 12:05, and across by 12:30. Kotzebue had gone from Leckwitz to the Elbe at Strehla, which he mistook for Groba, on his map, where he made his crossing and engaged in some discussion with several Russian Officers before being returned to the west bank of the river and transported to another crossing site at a ferry farther north. Later that day, after meeting Kotzebue, Major Frederick W. Craig made contact with the Soviets at 16:45 in Clanzchwitz. These two contacts thus far had come in the sector of General Rusakov's 175th Infantry Regiment, whose commander was Lieutenant Colonel Alexander T. Gardiev.

The same day, at 16:00, Second Lieutenant William D. Robertson also made contact with Soviet elements. The line continued to form as American, British, French and Soviet forces took control of, or defeated, Nazi forces, up until the time of the May 8 unconditional surrender of Germany and beyond. This line of contact did not conform to the agreed-upon occupation zones, as stipulated in the Yalta Conference. Rather, it was simply the place where the two armies met each other. The Western Allies had actually gone far beyond the Yalta agreement boundaries, in some cases up to 320 kilometres (200 mi) past, going deep into the states of Mecklenburg, Saxony-Anhalt, Saxony, as well as Brandenburg. The capital of Mecklenburg, the city of Schwerin, was captured on May 2, 1945. The city of Leipzig, in Saxony, was probably the largest of the cities captured by the Americans that were inside the areas to be later passed to the Soviets. The land of Thuringia was completely occupied by American forces. Other places where Western Allied Forces crossed the demarcation lines were:

Schwerin, Magdeburg, taken over by the Soviet from the British on July 1, 1945 Leipzig, taken over by the Soviets from the Americans on July 3, 1945 Erfurt, evacuated by American forces between July 1 and 2, and occupied by the Soviets on July 3 Other points of contact between Western Allies forces and Soviet forces before the end of the war in Europe were:

Wismar on the Baltic coast The Stör Canal, where Soviet and American forces met on May 4, 1945 Dessau and Pratau, contact being made on 26 April 1945, an area east of Leipzig Linz, where Soviet and American armies met in Austria Trieste, where New Zealand units and Yugoslavian partisans made contact on May 3, 1945 US forces generally held onto these gains within Germany until July 1945, when under orders from President Harry S. Truman – and against the advice of British Prime Minister Winston Churchill – the US forces withdrew to the Yalta agreement boundaries dividing Germany into occupation zones. The Soviet Union might not have allowed American, British and French forces into Berlin, which was completely under their control, if the U.S. had not honored the Yalta agreement boundaries. The German areas relinquished by American troops became part of the Soviet-dominated East Germany. The US Army did not withdraw from western Czechoslovakia until December 1945, as part of an agreement removing all American and Soviet troops from the country. US, British, French and Soviet controlled territory in Austria was incorporated into an occupation plan. Austria remained technically an occupied country by the Four Powers until 1955, when all foreign troops departed. Austria became a neutral country outside of the Iron Curtain, whereas Czechoslovakia fell inside the Iron Curtain and thus allied with the Soviet Union through the Warsaw Pact.

See also Elbe Day

References

External links CBC Archives CBC Radio reports on the Russian and American meeting at Torgau on May 1, 1945.

Illustrations

Line of Contact: A commemorative plaque now stands where the "East Meets West" moment took place in Torgau on Elbe Day, 1945.
A commemorative plaque now stands where the "East Meets West" moment took place in Torgau on Elbe Day, 1945.
Line of Contact: Final positions of the Western Allied and Soviet armies, May 1945
Final positions of the Western Allied and Soviet armies, May 1945
Line of Contact: Allied occupied areas, 15 May 1945, with territory under Allied control on 1 May 1945 in pink and later Allied gain in red
Allied occupied areas, 15 May 1945, with territory under Allied control on 1 May 1945 in pink and later Allied gain in red
Line of Contact: Final positions of the Western Allied and Soviet armies, May 8, 1945. Areas not yet occupied also indicated.
Final positions of the Western Allied and Soviet armies, May 8, 1945. Areas not yet occupied also indicated.
Line of Contact: Areas vacated by U.S. forces to Soviet forces in summer 1945 shown in lilac, not including the areas of Mecklenburg already ceded by US/British forces to Soviet control earlier
Areas vacated by U.S. forces to Soviet forces in summer 1945 shown in lilac, not including the areas of Mecklenburg already ceded by US/British forces to Soviet control earlier

Worked examples

Example 1 — a first encounter with Line of Contact

Start with the simplest possible case. Write down what Line of Contact claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Line of Contact before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Line of Contact ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Line of Contact

In research
Line of Contact appears in mathematics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Line of Contact in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Line of Contact is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aftermath of World War II, Allied occupation of Germany, Borders, so understanding it makes those chapters shorter.
In everyday life
Look for Line of Contact outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Line of Contact in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Line of Contact means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Line of Contact out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Line of Contact in simple terms?

The Line of Contact marked the farthest advance of American, British, French, and Soviet armies into German controlled territory at the end of World War II in Europe. In general a "line of contact" refers to the demarcation between two or more given armies, whether they are allied or belligerent.

Why does Line of Contact matter?

Because it connects several mathematics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Line of Contact?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Line of Contact.

Tags

  • Aftermath of World War II
  • Allied occupation of Germany
  • Borders
  • Soviet Union–United States relations
  • World War II occupied territories

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