Those who entertained these sentiments, however, kept them to themselves, while the rest fraternized to the best of their power with the troops, many of whom were quartered in the town. As for amusements, there were for the officers the theaters and an opera, while many of the ladies staying in Brussels kept almost open houses; races and athletic sports were got up for the men. The weather at the latter end of May and during the early days of June was delightful; and although all knew that the storm might at any moment burst, it was difficult to believe while so enjoying themselves that to-morrow they might be called upon to meet the enemy in deadly conflict. Even Denis Mulligan had nothing to complain about in his rations, and allowed to Ralph that the Belgians were much more decent people than he had expected to find them. The months of April and May had passed quietly on the frontier. The cavalry of the allied army on one side, and the French mounted gendarmerie on the other, maintained a vigilant watch over each others' movements, and each endeavored to prevent the passing out of persons who might carry news of the intentions and position of their armies. But the line was far too long to be strictly watched, and French loyalists on the one side and Belgian sympathizers with France on the other, managed to pass with sufficient regularity to keep the generals informed of the movements of their opponents. Wellington, then, was perfectly aware of the gathering of Napoleon's forces upon the other side of the frontier; but they, like his own troops were scattered over a long front, and yet there was no indication whatever as to the point where Napoleon was likely to break through. During the past three months large bodies of men had labored to restore the ruined fortifications of the frontier towns. The moats had been cleared out and deepened, the walls repaired, and the sluices restored, so that in case of necessity a wide tract of country could be laid under water. These precautions had been specially taken on the right of the British position where Wellington expected Napoleon's attack, and the general calculated that with the aid of the obstacles so interposed to Napoleon's advance, the troops stationed there would be able to check the tide of invasion until the whole army arrived to their assistance. The country between Brussels and the frontier was reconnoitered, and engineer officers were employed in making sketches of all the positions that appeared likely to offer special advantages as battlefields for an army standing on the defense.