WW2 Invasion of France

By May 1940, Europe had been at war for nine months. Yet Britain and France, despite having declared war on Germany in September 1939 following Hitler’s attack on Poland, had seen little real fighting. This tense period of anticipation – which came to be known as the ‘Phoney War’ – met an abrupt end on 10 May 1940, when Germany launched an invasion of France and the Low Countries.

The German plan of attack, codenamed Case Yellow, entailed an armoured offensive through the Ardennes Forest, which bypassed the strong French frontier defences of the Maginot Line. The advance would then threaten to encircle French and British divisions to the north, stationed on the Belgian frontier.

The German offensive quickly overwhelmed Dutch forces, and the bombing of Rotterdam persuaded the Netherlands to surrender on 15 May. And although German forces in the north encountered strong French and Belgian resistance, the main German thrust through the Ardennes met with tremendous success. French second-rate divisions in the area were not prepared or equipped to deal with the major armoured thrust that developed (the forest and poor roads were thought to make this impossible), and were hammered by incessant attacks by German bombers.

Just four days into the invasion German troops crossed the Meuse river, and had broken through the French lines. Attempts by the Allies to launch counterattacks by air and land either failed with heavy losses, or were thwarted by the pace of events. The British Expeditionary Force, along with the best units of the French army, were still in the north and had seen little fighting. But the German breakthrough to the south now forced them into rapid retreat to avoid being cut off with their backs to the sea. On 20 May German tanks reached Amiens and effectively trapped the British, who now made for Dunkirk and an unlikely attempt at evacuation to England.

In these desperate circumstances, an evacuation plan known as ‘Operation Dynamo’ was hastily prepared in Dover by Vice Admiral Bertram Ramsay. His strategy included an appeal for all civilian vessels that could cross the Channel to help ferry the troops from the beaches to larger ships offshore, or to evacuate them entirely. Between 26 May and 4 June - a period during which Hitler halted the advance of his troops on Dunkirk - 200,000 British and 140,000 French troops were evacuated to England. Nine allied destroyers and approximately 200 civilian vessels were lost during the evacuation, and the RAF suffered severe casualties covering the operation from the air.

On 5 June, the Germans swung southwards and French resistance finally collapsed, although not without heavy fighting. On 10 June, Italy opportunistically entered the war on Germany’s side. Four days later, the French capital fell, provoking the flight of the French Government to Bordeaux. The Government capitulated on 25 June, just seven weeks after the beginning of the invasion.

The British 51st Highland Division - stationed in the Maginot Line when the fighting started – was forced to surrender at St Valéry. During the final evacuation of British troops from St Nazaire on the Atlantic coast, the troopship Lancastria was sunk with the loss of around 4,000 refugees, British troops and crew.

Reluctant to take the risk that the French Navy would end up under German control, Churchill ordered the Royal Navy to present French warships at Mers-el-Kebir with an ultimatum to sail to Britain or to a neutral port for internment. When this offer was rejected on 3 July, British ships bombarded the fleet, killing 1,600 people. Although this operation did much to assure America of the strength of the British purpose, it and the evacuation of Dunkirk did immeasurable damage to Franco-British wartime relations.

WW2 era German half-tracks

There were four main model modifications (Ausführung A through D), which formed the basis for at least 22 variants. The initial idea was for a vehicle that could be used to transport a single squad of panzer-grenadiers to the battlefield protected from enemy small arms fire, and with some protection from artillery fire. In addition, the standard mounting of at least one MG 34 or MG 42 machine gun allowed the vehicle to provide support by fire for the infantry squad once they had disembarked in battle.

Positive aspects of the open top included greater situational awareness and faster egress by the infantry, as well as the ability to throw grenades and fire over the top of the fighting compartment as necessary while remaining under good horizontal cover. The downside was a major vulnerability to all types of plunging fire; this included indirect fire from mortars and field artillery, as well as depressed-trajectory small arms fire from higher elevated positions, lobbed hand grenades, even Molotov's cocktails, and strafing by enemy aircraft.

The first two models were produced in small numbers from 1939. A and B models can be identified by the structure of the nose armor, which comprised two trapezoidal armor panels - the lower of which had a cooling hatch. The B model, which began production in 1940, eliminated the fighting compartment's side vision slits.

The C model, which started production in mid-1940, featured a simplified hexagonal-shaped forward armored plate for the engine. Models A through C had rear doors that bulged out. The C model had a large production run, but was quite complex to build, involving many angled plates that gave reasonable protection from small arms fire. From early 1943, the D model was developed with the purpose of halving the number of angled body plates, simplifying the design and thus speeding up the production. D models can be easily recognized by their single piece sloping rear (with flat doors).

The standard personnel carrier version was equipped with a 7.92 mm MG 34 or MG 42 machine gun mounted at the front of the open compartment, above and behind the driver. A second machine gun could be mounted at the rear on an anti-aircraft mount.

Variants were produced for specialized purposes, including with anti-aircraft guns, light howitzers, anti-tank guns and mortars or even large unguided artillery rockets, as well as a version with an infrared search light used to spot potential targets for associated Panther tanks equipped with infrared detectors.

Another potentially good design feature of the Sd.Kfz.251 was the large track area, with the characteristic "slack track" design with no return rollers for the upper run of track, and the Schachtellaufwerk system of overlapping and interleaved main road wheels common to virtually all German halftracks of the period.

This lowered the ground pressure and provided better traction, giving the Sd.Kfz.251 better cross country performance than most other nations' half-tracked vehicles. However, the interleaved and overlapping main road wheels shared a major problem with the Tiger I and Panther main battle tanks that also used such road wheel configurations - in muddy or winter weather conditions, such as those during a rasputitsa mud season or the coldest Russian winter conditions, accumulated mud and snow could freeze solid between the road wheels, immobilizing the vehicle.