By 3 p.m., the British reinforcements had arrived, which included the
47th Regiment of Foot and the 1st Marines, and the British were ready to march. Brigadier General Pigot's force were gathering just south of Charlestown village, and they were already taking casualties from sniper fire from the settlement. Howe asked Admiral Graves for assistance in clearing out the snipers. Graves had planned for such a possibility and ordered a
carcass fired into the village, and then sent a landing party to set fire to the town. The smoke billowing from Charlestown lent an almost surreal backdrop to the fighting, as the winds were such that the smoke was kept from the field of battle.
First attack General Howe led the light infantry companies and grenadiers in the assault on the American left flank along the rail fence, expecting an easy effort against Stark's recently arrived troops. His light infantry were set along the narrow beach, in column formation, in order to turn the far left flank of the colonial position. The grenadiers were deployed in the center, lining up four deep and several hundred across. Pigot was commanding the
5th,
38th,
43rd, 47th, and
52nd regiments, as well as Major Pitcairn's Marines; they were to feint an assault on the redoubt. Just before the British advanced, the American position along the rail fence was reinforced by two pieces of artillery from Bunker Hill. Howe had intended the advance to be preceded by an artillery bombardment from the field pieces present, but it was soon discovered that these cannon had been supplied with the wrong caliber of ammunition, delaying the assault. Attacking Breed's Hill presented an array of difficulties. The hay on the hillside had not been harvested, requiring that the regulars marched through waist-high grass which concealed the uneven terrain beneath. The pastureland of the hillside was covered with crisscrossing rail fences hampering the cohesion of marching formations. The regulars were loaded down with gear wholly unnecessary for the attack, and the British troops were overheating in their wool uniforms under the heat of the afternoon sun, compounded by the nearby inferno from Charlestown. The colonists withheld their fire until the regulars were within at least 50 paces of their position. As the regulars closed in range, they suffered heavy casualties from colonial fire. The colonists benefited from the rail fence to steady and aim their muskets, and enjoyed a modicum of cover from return fire. Under this withering fire, the light companies melted away and retreated, some as far as their boats.
James Abercrombie, commanding the Grenadiers, was fatally wounded. Pigot's attacks on the redoubt and breastworks fared little better; by stopping and exchanging fire with the colonists, the regulars were fully exposed and suffered heavy losses. They continued to be harried by snipers in Charlestown, and Pigot ordered a retreat after seeing what happened to Howe's advance. By the time the first attack had petered out, 96 British regulars had been killed.
Second attack The regulars reformed on the field and marched out again, this time navigating a field strewn with dead and wounded comrades. This time, Pigot was not to feint; he was to assault the redoubt directly, possibly without the assistance of Howe's force. Howe advanced against Knowlton's position along the rail fence, instead of marching against Stark's position along the beach. The outcome of the second attack was very much the same as the first. One British observer wrote, "Most of our Grenadiers and Light-infantry, the moment of presenting themselves lost three-fourths, and many nine-tenths, of their men. Some had only eight or nine men a company left." Pigot's attack did not enjoy any greater success than Howe, and he ordered a retreat after almost 30 minutes of firing ineffective volleys at the colonial position. The second attack had failed. Meanwhile, confusion continued in the rear of the colonial forces. General Putnam tried with limited success to send additional troops from Bunker Hill to the forward positions on Breed's Hill to support the embattled regiments. One colonial observer wrote to
Samuel Adams afterwards, "it appears to me that there was never more confusion and less command". Some companies and leaderless groups of men moved toward the field; others retreated. They were running low on powder and ammunition, and the colonial regiments suffered from a hemorrhage of deserters. By the time that the third attack came, there were only 700–800 men left on Breed's Hill, with only 150 in the redoubt. Connecticut's Captain
John Chester saw an entire company in retreat and ordered his company to aim muskets at them to halt the retreat; they turned about and headed back to the battlefield. The British rear was also in disarray. Wounded soldiers that were mobile had made their way to the landing areas and were being ferried back to Boston, while the wounded lying on the field of battle were the source of moans and cries of pain.
Third attack Howe sent word to Clinton in Boston for additional troops. Clinton had observed the first two attacks and sent around 400 men from the 2nd Marines and the
63rd Foot, and followed himself to help rally the troops. In addition to these reserves, he convinced around 200 walking wounded to form up for the third attack. The third assault was to concentrate squarely on the redoubt, with only a feint on the colonists' flank. Howe ordered his men to remove their heavy packs and leave all unnecessary equipment behind. He arrayed his forces in column formation rather than the extended order of the first two assaults, exposing fewer men along the front to colonial fire. The third attack was made at the point of the bayonet and successfully carried the redoubt; however, the final volleys of fire from the colonists cost the life of Major Pitcairn. The defenders had run out of ammunition, reducing the battle to close quarters combat. The advantage turned to the British, as their troops were equipped with bayonets on their muskets, while most of the colonists were not. Colonel Prescott, one of the last men to leave the redoubt, parried bayonet thrusts with his normally ceremonial sabre. British forces killed thirty defenders in the melee and forced the rest into a retreat. It is during the retreat from the redoubt that Joseph Warren was shot in the face and killed. British ships rained iron shot down on the Neck, killing a number of Americans including Major Andrew McClary. The retreat of much of the colonial forces from the peninsula was made possible in part by the controlled withdrawal of the forces along the rail fence, led by John Stark and Thomas Knowlton, which prevented the encirclement of the hill. Burgoyne described their orderly retreat as "no flight; it was even covered with bravery and military skill". It was so effective that most of the wounded were saved; most of the prisoners taken by the British were mortally wounded. ==Aftermath==