Faced with the new threat,Arthur had sought the services of as many as possible of the officers he had commanded in the Peninsula. Most had answered the call, but others had been imposed upon him, like his cavalry commander, the Earl of Uxbridge. It was the same with many of the staff officers who had been appointed by the Duke of York before Arthur arrived from Vienna.

Then there was the dubious quality, and loyalty, of the allied troops that made up two-thirds of his army. King William of the Netherlands had at first refused to agree to place his men under Arthur’s command and had reluctantly consented only after intense diplomatic pressure from London, and the payment of a large subsidy in gold. Arthur had decided to distribute the most unreliable of his allied troops amongst his redcoats to lessen the impact of any treacherous sentiments. Picton was right to complain, Arthur reflected as the other officers took their seats. But that was the hand that he had been dealt and he must do the best he could.

At least Kitty and his sons were safe. Somerset had escorted them back to England before joining Arthur in Brussels. They had left Paris only a few days before Napoleon had arrived and Somerset had taken the commendable precaution of burning all the embassy’s records before leaving. Unfortunately, the Bourbons had failed to show the same good sense and Napoleon had discovered the secret treaty that had been signed between Austria, France and England at the start of the year. When the details had been published in the French newspapers the Prussians and Russians had been outraged, and many of the officers in Blьcher’s army were hostile and suspicious of their English allies in consequence.

When the soup had been served, Arthur leaned towards Uxbridge and asked quietly, ‘Any fresh reports of enemy activity on our right flank?’

‘Nothing new. The Frogs seem to be there in strength, judging by what they show us along the frontier. Of course, if I had permission to send patrols into France we would have a far clearer picture.’

‘Out of the question. My orders are to hold the army in readiness until war is declared. If we cross the frontier we become the aggressors.’

‘Something of a nicety,’ Uxbridge said dismissively. ‘It is hard to believe that war can be avoided at this stage.’

‘Nevertheless, we have our orders. In the meantime, I am concerned that Bonaparte may attempt to strike to the west of Brussels, and cut us off from the sea. The army must be ready to concentrate against an attack from that quarter. So, we must have adequate warning from your cavalry patrols, Uxbridge. They must stay alert.’

‘I have them in hand, your grace. You’ll be amongst the first to know if Boney goes for the coast, or takes the Mons road to Brussels.’

‘That is well.’ Arthur paused a moment. ‘Blьcher’s chief of staff is demanding to know where I intend to concentrate my army in the event of an attack. I cannot tell him until I know where the main weight of the French army is positioned.’

‘Damned Prussians,’ Uxbridge muttered before he raised his spoon and took a sip. His eyes lit up. ‘I say, fine soup.’

Arthur suppressed a sigh. He had been trying to keep up the morale of his army, and that of his Belgian hosts, by insisting that the social life of Brussels continue as if there were no threat of war. The difficulty of that was that many of his officers were playing their part too well and appeared to have scant concern for the presence of a French army gathering on the other side of the border.

He forced himself to make inane conversation with Uxbridge, until the end of the first course. Then, as the dishes were cleared away, a staff officer entered the dining room and hurried to Arthur’s side and leaned towards his ear.

‘Your grace, there is a Prussian officer waiting in the hall. He says he has an urgent despatch from Marshal Blьcher’s headquarters.’

Arthur nodded, and smiled apologetically to his guests as he rose from his seat at the head of the table. ‘Pray continue the meal, gentlemen. I shan’t be long.’

He followed the officer outside to where the mud-bespattered Prussian waited. Despite his anxious expression, the Prussian snapped to attention and bowed stiffly before speaking in heavily accented English.

‘I come from General Gneisenau, your grace. The chief of staff begs to inform you that the French attacked our position at Thuin at eight o’clock this morning.’

‘In what strength?’

‘Enough to drive in our outposts and then take the town, your grace.’

‘Are the French attacking anywhere else?’

‘I don’t know.’

‘Very well.’ Arthur nodded his thanks. ‘Tell General Gneisenau that I am concentrating my army. I will send word of my position as soon as I can.’

The Prussian bowed his head again and turned to stride back towards the entrance of the house Arthur had rented in the heart of the city. Arthur turned to the staff officer. ‘Get to headquarters at once. Tell Somerset to issue orders to every formation. The army is to form up and be ready to march as soon as orders are issued.’

‘Yes, sir.’ The officer turned away and increased his pace.

‘Walk, my boy, don’t run! We must appear calm in front of the local people.’

‘Yes, sir,’ the young officer replied, chastened.

Arthur returned to the dining room and sat back down. Picking up his fork he rapped the side of his glass. ‘Quiet, gentlemen.’

The officers turned towards him.

‘The French have crossed the border,’ he announced. ‘They attacked one of Blьcher’s formations.’

‘At last.’ Uxbridge smiled. ‘Where was this?’

‘At Thuin. The question is, does this constitute the main thrust of their attack, or is it a feint?’

‘A feint?’ Picton growled. ‘Are you saying that Boney’s trying to lure us towards the Prussians? That makes no military sense to me.’

‘It does, if he means to break through on our right and sever our communications.’ Arthur paused. ‘That is what I believe his intention to be, for the present. To guard against that possibility, the army will concentrate to the west of Thuin. If there is any indication that this is not a feint, then we will adjust our position accordingly. I have given the order for the army to make ready to march. I will also send an order to General Dцrnberg at Mons to probe for any sign of the enemy to his front. Meanwhile we shall wait until the situation becomes clear. Now, gentlemen, you know my policy with regard to the local people and our own civilians. We will attend tonight’s ball and there is to be no mention of this attack. I suggest you make the most of the entertainment, since it may be the last such occasion for a while.’

Shortly after ten o’clock Arthur was talking to Uxbridge when he saw the guests stir by the entrance to the ballroom as a figure in a riding cloak entered and scanned the room. Arthur recognised him at once - General Mьffling, the officer assigned to liaise between the headquarters of the two allied armies. As soon as he caught sight of Arthur the Prussian hurried through the crowd towards him.

‘I fear the game is up,’ Arthur muttered as the dancing stopped and the orchestra fell silent. All eyes were turning towards him.

‘So it seems.’ Uxbridge nodded.

Mьffling had been riding hard and his cloak and boots were smeared with mud. ‘Sir, Marshal Blьcher sent me.’

‘Come.’ Arthur placed an arm on the Prussian’s shoulder. ‘Let us converse somewhere quiet, and I shall have refreshments brought to you.’

He led Mьffling through a door at the side of the ballroom. Beyond, lit by a single candlestick, lay a small room used to store chairs. Arthur gestured to catch Somerset’s attention and pointed towards the orchestra before closing the door behind him. As the music struck up Arthur turned to Mьffling.

‘What news?’