The peninsula of Ticonderoga consists of a rocky plateau, with low grounds on each side, bordering Lake Champlain on the one hand, and the outlet of Lake George on the other. The fort stood near the end of the peninsula, which points towards the southeast. Thence, as one goes westward, the ground declines a little, and then slowly rises, till, about half a mile from the fort, it reaches its greatest elevation, and begins still more gradually to decline again. Thus a ridge is formed across the plateau between the steep declivities that sink to the low grounds on right and left. Some weeks before, a French officer named Hugues had suggested the defence of this ridge by means of an abatis. Montcalm approved his plan; and now, at the eleventh hour, he resolved to make his stand here. The two engineers, Pontleroy and Desandrouin, had already traced the outline of the works, and the soldiers of the battalion of Berry had made some progress in constructing them. At dawn of the seventh, while Abercromby, fortunately for his enemy, was drawing his troops back to the landing-place, the whole French army fell to their task. The regimental colors were planted along the line, and the officers, stripped to the shirt, took axe in hand and labored with their men. The trees that covered the ground were hewn down by thousands, the tops lopped off, and the trunks piled one upon another to form a massive breastwork. The line followed the top of the ridge, along which it zigzagged in such a manner that the whole front could be swept by flank fires of musketry and grape. Abercromby describes the wall of logs as between eight and nine feet high; in which case there must have been a rude banquette, or platform to fire from, on the inner side. It was certainly so high that nothing could be seen over it but the crowns of the soldiers' hats. The upper tier was formed of single logs, in which notches were cut to serve as loopholes; and in some places sods and bags of sand were piled along the top, with narrow spaces to fire through. From the central part of the line the ground sloped away like a natural glacis; while at the sides, and especially on the left, it was undulating and broken. Over this whole space, to the distance of a musket-shot from the works, the forest was cut down, and the trees left lying where they fell among the stumps, with tops turned outwards, forming one vast abatis, which, as a Massachusetts officer says, looked like a forest laid flat by a hurricane. But the most formidable obstruction was immediately along the front of the breastwork, where the ground was covered with heavy boughs, overlapping and interlaced, with sharpened points bristling into the face of the assailant like the quills of a porcupine. As these works were all of wood, no vestige of them remains. The earthworks now shown to tourists as the lines of Montcalm are of later construction; and though on the same ground, are not on the same plan.

Here, then, was a position which, if attacked in front with musketry alone, might be called impregnable. But would Abercromby so attack it? He had several alternatives. He might attempt the flank and rear of his enemy by way of the low grounds on the right and left of the plateau, a movement which the precautions of Montcalm had made difficult, but not impossible. Or, instead of leaving his artillery idle on the strand of Lake George, he might bring it to the front and batter the breastwork, which, though impervious to musketry, was worthless against heavy cannon. Or he might do what Burgoyne did with success a score of years later, and plant a battery on the heights of Rattlesnake Hill, now called Mount Defiance, which commanded the position of the French, and whence the inside of their breastwork could be scoured with round-shot from end to end. Or, while threatening the French front with a part of his army, he could march the rest a short distance through the woods on his left to the road which led from Ticonderoga to Crown Point, and which would soon have brought him to the place called Five-Mile Point, where Lake Champlain narrows to the width of an easy rifle-shot, and where a battery of field-pieces would have cut off all Montcalm's supplies and closed his only way of retreat. As the French were provisioned for but eight days, their position would thus have been desperate. They plainly saw the danger; and Doreil declares that had the movement been made, their whole army must have surrendered. Montcalm had done what he could; but the danger of his position was inevitable and extreme. His hope lay in Abercromby; and it was a hope well founded. The action of the English general answered the utmost wishes of his enemy.

Abercromby had been told by his prisoners that Montcalm had six thousand men, and that three thousand more were expected every hour. Therefore he was in haste to attack before these succors could arrive. As was the general, so was the army. "I believe," writes an officer, "we were one and all infatuated by a notion of carrying every obstacle by a mere coup de mousqueterie." Leadership perished with Lord Howe, and nothing was left but blind, headlong valor.

Clerk, chief engineer, was sent to reconnoitre the French works from Mount Defiance; and came back with the report that, to judge from what he could see, they might be carried by assault. Then, without waiting to bring up his cannon, Abercromby prepared to storm the lines.

The French finished their breastwork and abatis on the evening of the seventh, encamped behind them, slung their kettles, and rested after their heavy toil. Lévis had not yet appeared; but at twilight one of his officers, Captain Pouchot, arrived with three hundred regulars, and announced that his commander would come before morning with a hundred more. The reinforcement, though small, was welcome, and Lévis was a host in himself. Pouchot was told that the army was half a mile off. Thither he repaired, made his report to Montcalm, and looked with amazement at the prodigious amount of work accomplished in one day. Lévis himself arrived in the course of the night, and approved the arrangement of the troops. They lay behind their lines till daybreak; then the drums beat, and they formed in order of battle. The battalions of La Sarre and Languedoc were posted on the left, under Bourlamaque, the first battalion of Berry with that of Royal Roussillon in the centre, under Montcalm, and those of La Reine, Béarn, and Guienne on the right, under Lévis. A detachment of volunteers occupied the low grounds between the breastwork and the outlet of Lake George; while, at the foot of the declivity on the side towards Lake Champlain, were stationed four hundred and fifty colony regulars and Canadians, behind an abatis which they had made for themselves; and as they were covered by the cannon of the fort, there was some hope that they would check any flank movement which the English might attempt on that side. Their posts being thus assigned, the men fell to work again to strengthen their defences. Including those who came with Lévis, the total force of effective soldiers was now thirty-six hundred.

Soon after nine o'clock a distant and harmless fire of small-arms began on the slopes of Mount Defiance. It came from a party of Indians who had just arrived with Sir William Johnson, and who, after amusing themselves in this manner for a time, remained for the rest of the day safe spectators of the fight. The soldiers worked undisturbed till noon, when volleys of musketry were heard from the forest in front. It was the English light troops driving in the French pickets. A cannon was fired as a signal to drop tools and form for battle. The white uniforms lined the breastwork in a triple row, with the grenadiers behind them as a reserve, and the second battalion of Berry watching the flanks and rear.

Meanwhile the English army had moved forward from its camp by the saw-mill. First came the rangers, the light infantry, and Bradstreet's armed boatmen, who, emerging into the open space, began a spattering fire. Some of the provincial troops followed, extending from left to right, and opening fire in turn; then the regulars, who had formed in columns of attack under cover of the forest, advanced their solid red masses into the sunlight, and passing through the intervals between the provincial regiments, pushed forward to the assault. Across the rough ground, with its maze of fallen trees whose leaves hung withering in the July sun, they could see the top of the breastwork, but not the men behind it; when, in an instant, all the line was obscured by a gush of smoke, a crash of exploding firearms tore the air, and grapeshot and musket-balls swept the whole space like a tempest; "a damnable fire," says an officer who heard them screaming about his ears. The English had been ordered to carry the works with the bayonet; but their ranks were broken by the obstructions through which they struggled in vain to force their way, and they soon began to fire in turn. The storm raged in full fury for an hour. The assailants pushed close to the breastwork; but there they were stopped by the bristling mass of sharpened branches, which they could not pass under the murderous crossfires that swept them from front and flank. At length they fell back, exclaiming that the works were impregnable. Abercromby, who was at the saw-mill, a mile and a half in the rear, sent orders to attack again, and again they came on as before.

The scene was frightful: masses of infuriated men who could not go forward and would not go back; straining for an enemy they could not reach, and firing on an enemy they could not see; caught in the entanglement of fallen trees; tripped by briers, stumbling over logs, tearing through boughs; shouting, yelling, cursing, and pelted all the while with bullets that killed them by scores, stretched them on the ground, or hung them on jagged branches in strange attitudes of death. The provincials supported the regulars with spirit, and some of them forced their way to the foot of the wooden wall.

The French fought with the intrepid gayety of their nation, and shouts of Vive le Roi! and Vive notre Général! mingled with the din of musketry. Montcalm, with his coat off, for the day was hot, directed the defence of the centre, and repaired to any part of the line where the danger for the time seemed greatest. He is warm in praise of his enemy, and declares that between one and seven o'clock they attacked him six successive times. Early in the action Abercromby tried to turn the French left by sending twenty bateaux, filled with troops, down the outlet of Lake George. They were met by the fire of the volunteers stationed to defend the low grounds on that side, and, still advancing, came within range of the cannon of the fort, which sank two of them and drove back the rest.

A curious incident happened during one of the attacks. De Bassignac, a captain in the battalion of Royal Roussillon, tied his handkerchief to the end of a musket and waved it over the breastwork in defiance. The English mistook it for a sign of surrender, and came forward with all possible speed, holding their muskets crossed over their heads in both hands, and crying Quarter. The French made the same mistake; and thinking that their enemies were giving themselves up as prisoners, ceased firing, and mounted on the top of the breastwork to receive them. Captain Pouchot, astonished, as he says, to see them perched there, looked out to learn the cause, and saw that the enemy meant anything but surrender. Whereupon he shouted with all his might: "Tirez! Tirez! Ne voyez-vous pas que ces gens-là vont vous enlever?" The soldiers, still standing on the breastwork, instantly gave the English a volley, which killed some of them, and sent back the rest discomfited.