After an hour at Windmill Hill the column formed up, reinforced with the men of the Thirty-fourth and a few more tanks. The prisoners were sent down to Bexhill, with a detachment of guards. Ernst felt in good spirits as the column set off for several more miles' walk along the A-road towards a place called Battle – so they were assured by the spotters. All the road signs had been removed from their posts, so the ordinary troops had no real idea where they were, in green English countryside that looked much the same whichever direction you marched.

They joined a major road at Boreham Street. Again the place was deserted, but the engineers came upon a petrol station. Adorned with metal advertising signs for Shell and Mobiloil, it was abandoned, but the engineers quickly discovered that one of the big underground tanks wasn't empty. Soon they were siphoning off the fuel and filling up the trucks.

But after half an hour the first of the trucks coughed, and ground to a halt. The fuel they had taken had burned to a sticky sludge and was wrecking the engine. The fuel had been doped, with sugar maybe. Cursing, the engineers had to stop all the trucks that had been refuelled at Boreham Street, and fill them again from the column's own dwindling supply, brought from the continent. It was another delay, another hour lost, another vehicle ruined.

As the column approached Battle the country became more difficult, with narrow valleys and low hills, a carpet of fields and hedgerows and copses – ideal cover. The men proceeded cautiously, as silently as possible. Sheep grazed calmly, watching the column pass.

Suddenly they came under heavy fire; it just erupted all around them. Leutnant Strohmeyer got a bullet in the arm, and swore furiously. The vehicles pulled off the road, and the men dived into the ditches by the road. A hail of bottles came spinning out of the woods. They were Molotov cocktails; they splashed where they fell, mostly harmlessly.

'I wonder where they got the bloody petrol,' Breitling muttered.

It was late afternoon by the time Mary approached Battle itself, where the refugees had been promised a convoy of vehicles would be waiting to take them further. There were many walking wounded after the Stuka attack, people moaning as they struggled to take one step after another. Mary did her best not to think of those left behind.

But an immense plume of flame rose up above Battle, bright in the sky of this late September Sunday. Mary heard the pop of guns and the deeper booming of artillery, and planes stitched the air. The walkers stalled. Mary heard muttering. But they could not go back; they plodded forward, for there was no choice.

They approached a crossroads. The road signs had been dismantled, but Mary heard mutterings that this was the transverse road that ran just south of Battle, joining two places she'd never heard of, Catsfield to the west and Sedlescombe to the east. The refugee flow pushed on across the road junction.

But just as Mary reached the junction there was a roar of some heavy engine. People screamed and scattered back out of the way. Mary was knocked to the ground in the crowd; she landed heavily.

A tank came roaring across the junction, heading from west to east. It stopped with a grind of gears, bang in the middle of the junction. It had a square black cross on its turret. An officer, his head and shoulders protruding from the turret, stared with astonishment at the people before him.

All that Sunday George picked up bits of news from the folk coming and going at the town hall.

There was a ferocious battle for Folkestone. The defenders were mostly a New Zealander division. Far from home, they fought well, but by two in the afternoon the Germans had taken the town. But the retreating troops blew up the harbour with its wharves and cranes.

Some German units had made it over the Channel today. But the hinge of the invasion would come overnight, when the bulk of the second echelon would try to make it across to their landing points at dawn on Monday. In advance of that a major battle was unfolding in the Channel. The RAF was strafing the flows of shipping and bombing the embarkation ports, all the while battling it out with the Luftwaffe, and trying to fend off bomber attacks on London and other inland cities. Its resources spread thin, the RAF was near collapse, so the rumours went. The Royal Navy also had split objectives, with a mandate to protect the Atlantic convoys even while the invasion was underway. But today the Home Fleet was fully deployed in the Channel. The destroyers and torpedo boats were taking on the Kriegsmarine, and were getting among the lines of barges and tugs returning from England.

And in Hastings, the Germans were here.

The first German troops arrived on bicycles at about six in the evening. They were soldiers, Wehrmacht as far as George knew, and they must have been scouts. They cycled casually, their rifles on their backs. They were unopposed. George stood at his post at the door of the town hall just off Queens Road, in his police uniform, helmet on, his canvas gas-mask bag slung over his shoulder. The scouts looked him over but otherwise ignored him.

Next came more infantry. They moved cautiously, walking so they hugged the walls to either side of the street, their rifles raised. They peered at upstairs windows, evidently fearful of snipers. But some of them kicked in the front doors of houses or smashed shop windows, and went in to emerge with clocks or bits of silver. After them came a motor-cycle detachment with route signs in German, replacements for the signs long taken down, cardboard placards which they strapped to lamp-posts and nailed to doorways.

Then followed a group of military policeman, the feldgendarmerie, with some junior Wehrmacht troopers. The MPs studied the town hall, and glared at George. Muttering in German, they picked out the building on a map. They ordered two of the soldiers to remain here, evidently on sentry duty. Then they strode on.

The men posted here looked at George, but, seeing he had no weapon and no intention of impeding them, got on with their work. They took a hammer and nails from a canvas bag, and nailed a poster to the town hall door. When they were done they took up their own position by the door, lounging, ignoring George, sharing a cigarette.

George glanced at the poster. It read,

PROCLAMATION TO THE PEOPLE OF ENGLAND:

And finally

SIX. I WARN ALL CIVILIANS THAT IF THEY UNDERTAKE ACTIVE OPERATIONS AGAINST THE GERMAN FORCES, THEY WILL BE CONDEMNED TO DEATH INEXORABLY.

It was signed by Field Marshal von Brauchitsch, 'Army Commander-in-Chief'. George supposed that where the Germans had up to now been a blank faceless mass, an amorphous enemy, now he would need to learn names such as this. He turned away.

Shortly after that, a more substantial column came rolling through the town: a couple of tanks, trucks, men on foot, horse-drawn carts and weapons. The troops looked weary to George; he saw salt stains on their boots.

At the head of the column was a rather fine car, a magnificent Bentley, silver grey. George wondered where they had liberated this beauty from – he could see why its owner hadn't had the heart to follow orders and disable it. A Wehrmacht soldier chauffeured it for a man in a black uniform, accompanied by a woman in a similar uniform, with bright blonde hair.