As soon as the assault force was across, the first of the pontoon bridges was towed into position. Behind it came the other nine, emerging from the small channel where they had been waiting, hidden from Austrian eyes. The engineers hauled them into position and fastened them to the posts already driven into the bank of Lobau island. Napoleon urged his mount forward to the nearest of the pontoon bridges and sent for the officer in charge.

‘How long will it take you to get the bridge into position, Lieutenant?’

‘Fifteen minutes, sire,’ the engineer replied at once.

‘I will give you five minutes,’ said Napoleon as he reached for his pocket watch. ‘I’ll be timing you.’

‘Yes, sire.’ The engineer saluted and turned to run down the bank to his men, already shouting his orders to get a boat across the river with a cable and some stout stakes to drive into the far bank. As soon as the stakes were pounded into position the engineers pulled the cable attached to the end of the bridge and with ponderous grace the line of pontoons and trestles angled across the current until it extended from bank to bank. As soon as the last cables had been tied securely to the stakes the engineering officer sprinted up to his Emperor and saluted as he stood to attention, chest heaving from his exertions.

‘Beg to report, the bridge is ready, sire.’

Napoleon thrust his pocket watch back inside his coat. ‘With nearly half a minute to spare. Fine work.’

‘Thank you, sire.’

‘Now, I’d be obliged if you would get the first of Masséna’s men across that bridge of yours.’

‘Yes, sire.’ The engineer saluted smartly and hurried off to the head of the bridge and waved the first company forward. The soldiers broke step as they reached the first trestle and then strode as quickly as they could across to the far bank. Further downriver Napoleon could just discern the outlines of the other bridges being swung into position across the current, and more of Masséna’s corps quickly crossed to the far bank. A few hundred paces inland, individual muskets flared as those enemy soldiers on watch who had managed to keep their powder dry opened fire on the assault party. Once the first division was across it marched off along the bank of the river to the north, making for the fortified village of Gross-Enzerdorff before pressing on to Essling.