Operation Aerial was the evacuation of Allied military forces and civilians from ports in western France. The operation took place from 15 to 25 June 1940 during the Second World War. The embarkation followed the Allied military collapse in the Battle of France against Nazi Germany. Operation Dynamo, the evacuation from Dunkirk and Operation Cycle from Le Havre, had finished on 13 June. British and Allied ships were covered from French bases by five Royal Air Force (RAF) fighter squadrons and assisted by aircraft based in England to lift British, Polish and Czechoslovak troops, civilians and equipment from Atlantic ports, particularly from St Nazaire and Nantes.
On 17 June, the evaded RAF fighter patrols and attacked evacuation ships in the Loire estuary, sinking the Cunard liner and troopship HMT which was carrying thousands of troops, RAF personnel and civilians. The ship sank quickly but nearby vessels went to the rescue and saved about and crew while under air attack. The death toll is unknown because the passenger count broke down in the haste to embark as many people as possible. Estimates of at least make the sinking the greatest loss of life in a British ship. The British government tried to keep the sinking of Lancastria secret on the orders of the Prime Minister Winston Churchill.
Some equipment was embarked on the evacuation ships but alarmist reports about the progress of the German Army towards the coast led some operations to be terminated early and much equipment was destroyed or left behind. The official evacuation ended on 25 June, in conformity with the terms of the Armistice of 22 June 1940 agreed by the French and German authorities but informal departures continued from French Mediterranean ports until 14 August. From the end of Operation Dynamo at Dunkirk, Operation Cycle from Le Havre, elsewhere along the Channel coast and the termination of Operation Aerial, another were rescued, bringing the total of military and civilian personnel returned to Britain during the Battle of France to British troops.
Background
Royal Navy
The evacuation of the British Expeditionary Force (BEF) from Dunkirk left a surplus of men on the lines-of-communication, base depots and other establishments among the still in France. Sufficient lines-of-communication personnel for an armoured division and four infantry divisions and an Advanced Air Striking Force (AASF) were to be retained and the rest returned to Britain. Naval operations in the Norwegian campaign and the evacuation of Dunkirk had suffered losses, which temporarily weakened the Home Fleet, particularly in smaller vessels needed to escort evacuation ships from the French Atlantic coast. Losses inflicted on the surface ships of the Kriegsmarine made it impossible for the Germans to challenge British naval supremacy in the English Channel and the Bay of Biscay. Seven German submarines patrolling off the west coast of France made no attempt to interfere and only the Luftwaffe was used against the evacuations. Operation Aerial was commanded by Admiral William Milbourne James, the Commander-in-Chief, Portsmouth. James lacked the vessels necessary for convoys and organised a flow of troopships, storeships and motor vehicle vessels from Southampton, coasters to ply from Poole and the Dutch schuyts to work from Weymouth, while such warships as were available patrolled the shipping routes. Demolition parties sailed in the ships but it was hoped that supplies and equipment could be embarked as well as troops.
RAF
After Dunkirk, the AASF squadrons in France had been moved to the area between Orléans and Le Mans during the lull before Fall Rot (Case Red), the German offensive over the Somme and Aisne rivers. From the new bases the AASF was able to operate anywhere along the front, but after the German breakthrough on 11 June, British Air Forces in France (Air Vice-Marshal Arthur Barratt) was warned by the Air Ministry to be ready for a quick getaway from France. The British squadrons were moved west to bases around Angers, Saumur, Rennes and Nantes, which were already full of French aircraft and severely congested. Barratt sent the light bomber squadrons back to England on 15 June and kept the five fighter squadrons to cover the evacuation of RAF ground staff and the three British divisions commanded by General Sir Alan Brooke.
After Marshal Philippe Pétain requested an armistice on 17 June, Barratt had to defend seven ports on the Atlantic coast and sent the AASF anti-aircraft batteries to La Pallice and La Rochelle, the least important embarkation harbours. Nantes and St Nazaire, the most important ports, were covered by 1 Squadron, 73 Squadron and 242 Squadron, with a small detachment covering Brest. Saint-Malo and Cherbourg were protected by 17 Squadron and 501 Squadron from the aerodrome at Dinard across the bay from Saint-Malo, then later from the Channel Islands. Fighter Command squadrons from RAF Tangmere were also available for Cherbourg and Coastal Command prepared to escort returning ships. Once the arrangements were made, Barratt left for England and the Senior Air Staff Officer (SASO), Air Vice-Marshal Douglas Evill took over.
Operations Dynamo and Cycle
Operation Dynamo, the evacuation at Dunkirk from 26 May to 3 June, had rescued much of the fighting element of the BEF. Some units from the 1st Armoured Division, the Beauman Division and more than and line-of-communication troops, had been cut off in the south by the German dash to the sea. By the end of May, medical stores had been removed from Dieppe and a demolition party landed, ready to blow up the port infrastructure. A big depot at Le Havre had been run down by feeding troops in the area from it and removing military stores not immediately needed. A reserve of motor transport collected at Rouen had been used as transport for improvised units and special ammunition had been moved from the reserve around Buchy but the removal of the huge quantity of ordinary ammunition there was impossible.
On 9 June, the French commander at Le Havre contacted the 10th Army and the 51st (Highland) Division with a message that the Germans had captured Rouen and were heading for the coast. Ihler, the IX Corps commander and Major-General Victor Fortune, commander of the 51st (Highland) Division, decided that the only hope of escape was through Le Havre and abandoned the plan to retire through Rouen. The port admiral requested enough ships from the Admiralty to remove but this contradicted the plans of the French supreme commander, Maxime Weygand. General John Dill (Chief of the Imperial General Staff) hesitated, ignorant that Weygand's delay in issuing the orders had made it impossible. The GOC British Troops in France, Lieutenant-General Sir Henry Karslake, had also urged several times that the retirement be accelerated but had no authority to issue orders. Only after receiving a message during the night from Fortune, that the 51st (Highland) Division was participating in a retreat by IX Corps towards Le Havre, did Dill learn of the true situation.
Fortune detached a force to guard Le Havre, comprising the 154th Infantry Brigade, A Brigade of the Beauman Division, two artillery regiments and engineers. Arkforce (Brigadier Stanley-Clarke), moved on the night of towards Fécamp, where most had passed through before the 7th Panzer Division arrived. A Brigade forced its way out but lost the wireless (radio) truck intended to keep contact with the 51st (Highland) Division. The possibility of holding a line from Fécamp to Lillebonne was discounted and Stanley-Clarke ordered Arkforce on to Le Havre. A Royal Navy demolition party had been in Le Havre since late May and the port was severely bombed by the on 7 June; two days later, the Admiralty sent orders for an evacuation. James sent a flotilla leader, , across the Channel, accompanied by six British and two Canadian destroyers, smaller craft and many Dutch .
A plan was hastily made to block Dieppe harbour and on 10 June, (Captain G. A. Garnon-Williams) escorted three blockships to the port. Two were sunk in the approach channel but the third ship hit a mine just outside, which prevented it being sunk at the entrance to the inner harbour. Beach parties landed at Le Havre to take control of the evacuation on 10 June and after a 24-hour postponement, the evacuation began on 11 June. The embarkation was hindered somewhat by the damage to the port caused by bombing; the troopship was damaged and had to be beached.
Electrical power to the docks was cut, rendering the cranes on the docks useless; loading vehicles via ramps was tried but was too slow. On 12 June, RAF fighters began patrolling the port, deterring more raids and an attempt was made to save the transport and equipment by diverting it over the Seine, via the ferry crossings at Caudebec or the ships at Quillebeuf at the river mouth. The quartermaster of the 14th Royal Fusiliers succeeded in getting the transport away. The greatest number of troops were removed on the night of and the evacuation was completed by dawn; of troops evacuated, of 'A' Brigade were taken to Cherbourg and the 154th Infantry Brigade sailed via Cherbourg to England.
St Valery-en-Caux On 10 June British destroyers reconnoitred the smaller ports to the east of Le Havre. was damaged by artillery fire from the cliffs near St. Valery-en-Caux during the evening. Troops not needed to hold the perimeter at St Valery moved down to the beaches and the harbour but no ships arrived; thick fog prevented them from moving inshore. An armada of ships and craft had been assembled but few had wireless (radio) and the fog obscured visual signalling. Only at Veules-les-Roses were many soldiers rescued, under fire from German artillery, which damaged the destroyers , and Ambuscade. Near dawn, the troops at the harbour were ordered back into the town, only to discover that the local French commander had already negotiated a surrender. A total of and soldiers were rescued but over of the 51st (Highland) Division were taken prisoner on 12 June.
Prelude 2nd BEF On 2 June, Brooke visited the War Office, having returned from Dunkirk on 30 May and was told by Dill to go back to France to assemble another BEF. In the emergency, the force would be the 51st (Highland) Infantry Division and 1st Armoured Division, already in France, with the 52nd (Lowland) Infantry Division and the 1st Canadian Infantry Division from Britain, to be followed by the 3rd Infantry Division as soon as it was re-equipped. The II Corps headquarters was spread around Britain after its return from Dunkirk and his first choice of chief of staff was busy with General Lord Gort, the former BEF commander, writing dispatches. Brooke warned Dill and the secretary of state for war, Anthony Eden, that the enterprise was futile, except as a political gesture. He was told that on return to France he would come under the authority of Weygand. In France, Fonblanque was still in command of the lines-of-communication troops of the original BEF and lieutenant-generals Karslake and James Marshall-Cornwall were assisting with command. A brigade group (the 157th (Highland Light Infantry) Brigade) of the 52nd (Lowland) Division departed for France on 7 June and Brooke returned five days later.