What is the best definition of a "blitzkrieg"?

The answer

The best definition of a blitzkrieg is a rapid, surprise military offensive that uses concentrated armored forces and air power to overwhelm an enemy before it can organize a defense. The German word means "lightning war," and that image captures the strategy: speed, shock, and concentration of force at a single point. On a multiple-choice exam, the correct answer is the option describing a fast, sudden invasion — not a slow siege, a defensive strategy, or a naval blockade.

Blitzkrieg combined several technologies and tactics that had matured by the late 1930s: fast-moving tank (panzer) divisions, motorized and mechanized infantry to keep pace with the tanks, close air support from dive-bombers like the Stuka, and radio communication that let commanders coordinate all of these in real time. Rather than spreading forces evenly along a front, the attacker concentrated them at a narrow point (the Schwerpunkt), broke through, and then raced deep into the enemy's rear to encircle and paralyze its forces.

Why the other options are wrong

Typical distractors describe the opposite of blitzkrieg:

• "A slow war of attrition / trench warfare" — this describes World War I's static Western Front, precisely the stalemate blitzkrieg was designed to avoid.
• "A defensive strategy of fortified lines" — that describes something like France's Maginot Line, not an offensive doctrine. Blitzkrieg is inherently attacking, not defending.
• "A naval blockade to starve the enemy" — a blockade is an economic and naval strategy with no relation to fast land warfare.
• "Aerial bombing of cities alone" — strategic bombing is one tool, but blitzkrieg is a combined-arms ground offensive supported by air power, not bombing by itself.

Any option that emphasizes slowness, defense, or a single service branch is incorrect.

The bigger picture

Germany used blitzkrieg to devastating early effect in World War II. In September 1939, panzer columns and the Luftwaffe overran Poland in about five weeks. In May–June 1940, an armored thrust through the Ardennes Forest bypassed the Maginot Line and defeated France and the Low Countries in roughly six weeks — a campaign that stunned the world. Early operations in the Soviet Union (Operation Barbarossa, 1941) also opened with blitzkrieg-style encirclements.

Why was it so effective? It exploited surprise, kept the enemy reacting instead of planning, and used mobility to make static defenses irrelevant. Its limits appeared later: blitzkrieg depended on fuel, functioning supply lines, and good terrain and weather. In the vast distances of the Soviet Union, and once opponents learned to absorb the initial shock and counterattack, the lightning strategy lost its edge. Understanding blitzkrieg therefore explains both Germany's rapid early conquests and why those advantages eventually ran out.