Scurvy, occasioned by salt provisions and cold, made fierce work in the garrison, and in the army scarce a man was free from it. On April 30th a return of Fraser's Highlanders, in the garrison at Quebec, showed three hundred and fourteen fit for duty, five hundred and eighty sick, and one hundred and six dead since September 18, 1759.

April 27th, the French under De Levi, in strong force advanced against the English, the latter being forced to withdraw within the walls of Quebec. Fraser's Highlanders was one of the detachments sent to cover the retreat of the army, which was effected without loss. At half-past six, the next morning General Murray marched out and formed his army on the heights of Abraham. The left wing was under Colonel Simon Fraser composed of the Highlanders, the 43rd, and the 23rd Welsh Fusiliers. The Highlanders were exposed to a galling fire from the bushes in front and flank and were forced to fall back; and every regiment made the best of its way into the city. The British loss was two hundred and fifty-seven killed and seven hundred and sixty-one wounded.

The Highlanders had about four hundred men in the field, nearly one-half of whom had that day, of their own accord, come out of the hospital. Among the killed were Captain Donald Macdonald, Lieutenant Cosmo Gordon and fifty-five non-commissioned officers, pipers and privates; their wounded were Colonel Fraser, Captains John Campbell of Dunoon, Alexander Fraser, Alexander MacLeod, Charles Macdonell; Lieutenants Archibald Campbell, son of Glenlyon, Charles Stewart, Hector Macdonald, John Macbean, Alexander Fraser, senior, Alexander Campbell, John Nairn, Arthur Rose, Alexander Fraser, junior, Simon Fraser, senior, Archibald McAlister, Alexander Fraser, John Chisholm, Simon Fraser, junior, Malcolm Fraser, and Donald McNeil; Ensigns Henry Munro, Robert Menzies, Duncan Cameron, of Fassifern, William Robertson, Alexander Gregorson and Malcolm Fraser, and one hundred and twenty-nine non-commissioned officers and privates.

Lieutenant Charles Stewart, engaged in the Rising of the Forty-Five, in Stewart of Appin's regiment, was severely wounded at Culloden. As he lay in his quarters after the battle on the heights of Abraham, speaking to some brother officers on the recent actions, he exclaimed, "From April battles, and Murray generals, good Lord deliver me!" alluding to his wound at Culloden, where the vanquished blamed lord George Murray for fighting on the best field in the country for regular troops, cavalry and artillery; and likewise alluding to his present wound, and to General Murray's conduct in marching out of a garrison to attack an enemy, more than treble his numbers, in an open field, where their whole strength could be brought to act. No time was lost in repeating to the general what the wounded officer had said; but Murray, who was a man of humor and of a generous mind, on the following morning called on his subordinate, and heartily wished him better deliverance in the next battle, when he hoped to give him occasion to pray in a different manner.

On the night of the battle De Levi opened trenches within six hundred yards of the walls of the city, and proceeded to besiege the city, while General Murray made preparations for defence. On May 1st the largest of the English blockhouses accidentally blew up, injuring Captain Cameron. On the 17th the French suddenly abandoned their entrenchments. Lord Murray pursued but was unable to overtake them. He formed a junction, in September with General Amherst.

General Amherst had been notified of the intended siege of Quebec by De Levi; but only persevered in the tardy plans which he had formed. Canada now presented no difficulties only such as General Amherst might create. The country was suffering from four years of scarcity, a disheartened, starving peasantry, and the feeble remains of five or six battalions wasted by incredible hardships. Colonel Haviland proceeded from Crown Point and took the deserted fort at Isle aux Noix. Colonel Haldimand, with the grenadiers, light infantry and a battalion of The Black Watch, took post at the bottom of the lake. General Amherst led the main body of ten thousand men by way of Oswego; why, no one can tell. The labor of going there was much greater than going direct to Montreal. After toiling to Oswego, he proceeded cautiously down the St. Lawrence, treating the people humanely, and without the loss of life, save while passing the rapids, he met, on September 7th, the army of lord Murray before Montreal, the latter on his way up from Quebec, intimidated the people and amused himself by burning villages and harrying Canadians. On the 8th Colonel Haviland joined the forces. Thus the three armies came together in overwhelming strength, to take an open town of a few hundred inhabitants who were ready to surrender on the first appearance of the English.

The Black Watch, or Royal Highlanders remained in America until the close of the year 1761. The officers were Lieutenant Colonel Francis Grant; Majors, Gordon Graham and John Reid; Captains, John McNeil, Allan Campbell, Thomas Graeme, James Stewart, James Murray, Thomas Stirling, William Murray, John Stuart, Alexander Reid, William Grant, David Haldane, Archibald Campbell, John Campbell, Kenneth Tolmie, William Cockburne; Captain-Lieutenant, James Grant; Lieutenants, John Graham, Alexander Turnbull, Alexander McIntosh, James Gray, John Small, Archibald Campbell, James Campbell, Archibald Lamont, David Mills, Simon Blair, David Barclay, Alexander Mackay, Robert Menzies, Patrick Balneaves, John Campbell, senior, John Robertson, John Grant, George Leslie, Duncan Campbell, Adam Stuart, George Grant, James McIntosh, John Smith, Peter Grant, Simon Fraser, Alexander Farquharson, John Campbell, junior, William Brown, Thomas Fletcher, Elbert Herring, John Leith, Archibald Campbell, Alexander Donaldson, Archibald Campbell, Patrick Sinclair, John Gregor, Lewis Grant, Archibald Campbell, John Graham, Allan Grant, Archibald McNab; Ensigns, Charles Menzies, John Charles St. Clair, Neil McLean, Thomas Cunison, Alexander Gregor, William Grant, George Campbell, Nathaniel McCulloch, Daniel Robertson, John Sutherland, Charles Grant, Samuel Stull, James Douglass, Thomas Scott, Charles Graham, James Robertson, Patrick Murray, Lewis Grant; Chaplain, Lauchlan Johnston; Adjutants, Alexander Donaldson, John Gregor; Quarter-Masters, John Graham, Adam Stewart; Surgeons, David Hepburn, Robert Drummond.

At the close of the year 1761 The Black Watch, with ten other regiments, among which was Montgomery's Highlanders, embarked for Barbadoes, there to join an armament against Martinique and Havanna. After the surrender of Havanna, the first battalion of the 42nd, and Montgomery's Highlanders embarked for New York, which they reached in the end of October, 1762. Before leaving Cuba, all the men of the second battalion of the 42nd, fit for service were consolidated with the first, and the remainder shipped to Scotland, where they were reduced the following year.

The 42nd, or The Black Watch was stationed at Albany till the summer of 1763 when they, with a detachment of Montgomery's Highlanders and another of the 60th, under command of Colonel Henry Boquet, were sent to the relief of Fort Pitt, then besieged by the Indians. This expedition consisting of nine hundred and fifty-six men, with its convoy, reached Fort Bedford, July 25, 1763. The whole country in that region was aroused by the depredations of the Indians. On the 28th Boquet moved his army out of Fort Bedford and marched to Fort Ligonier, where he left his train, and proceeded with pack-horses. Before them lay a dangerous defile, several miles in length, commanded the whole distance by high and craggy hills. On August 5th, when within half a mile of Bushy-Run, about one o'clock in the afternoon, after a harrassing march of seventeen miles, they were suddenly attacked by the Indians; but two companies of the 42nd Highlanders drove them from their ambuscade. When the pursuit ceased, the savages returned. These savages fought like men contending for their homes, and their hunting grounds. To them it was a crisis which they were forced to meet. Again the Highlanders charged them with fixed bayonets; but as soon as they were driven from one post they appeared at another, and at last entirely surrounded the English, and would have entirely cut them off had it not been for the cool behavior of the troops and the good manœuvering of the commander. Night came on, and the English remained on a ridge of land, commodious for a camp, except for the total want of water. The next morning the army found itself still in a critical position. If they advanced to give battle, then their convoy and wounded would fall a prey to the enemy; if they remained quiet, they would be picked off one by one, and thus miserably perish. Boquet took advantage of the resolute intrepidity of the savages by feigning a retreat. The red men hurried to the charge, when two companies concealed for the purpose fell upon their flank; others turned and met them in front; and the Indians yielding to the irresistible shock, were utterly routed.

The victory was dearly bought, for Colonel Boquet, in killed and wounded, in the two days action, lost about one-fourth of his men, and almost all his horses. He was obliged to destroy his stores, and was hardly able to carry his wounded. That night the English encamped at Bushy Run, and four days later were at Fort Pitt. In the skirmishing and fighting, during the march, the 42nd, or The Black Watch, lost Lieutenants John Graham and James Mackintosh, one sergeant and twenty-six rank and file killed; and Captain John Graham of Duchray, Lieutenant Duncan Campbell, two serjeants, two drummers, and thirty rank and file, wounded. Of Montgomery's Highlanders one drummer and five privates were killed; and Lieutenant Donald Campbell and volunteer John Peebles, three serjeants and seven privates wounded.