Scottish war-cries were very different than the Rebel Yell. Every clan had its own version. In low-land Scotland it was called a "slogan", in highland Scotland it was called a "flughorn".
from..."MacDonnells of Antrim: Notices of Some Other Sents, Irish and Scottish" Rev. George Hill, 1873.
"The slogan.—The Scots, like their progenitors, the Irish, always attacked the enemy with loud shoutings, preserving silence, however, until the very moment of the onset. Slogan (sluagh-ghairm) is the Scottish word generally used for the gaoir-catha, or clan war-cry of the Gael. (See Logan's Scottish Gael, vol. i., pp. 154, 155; see also a learned paper on Irish War- Cries in the Ulster Journal of Archaeology, vol. Hi., pp. 203—212.) Among the Highland clans their war-cries were often the names of places, which seem to have operated like charms on the soldiers. In Scotland, it was customary for the Macdonnells to rush forward in a charge with the cry Fraoch Eilan, 'Heathy Island' (see p. 57, supra); but whether this was used as their war-cry in Ulster we are unable to say. The war-cry of the Campbells was Bencruachan: of the MacFarlands Loch-Sliodh; of the MacGregors Ardchoille; of the MacKenzies Tu/lach-Ard, &c, &c."
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from..."A history of the Scottish Highlands, Highland clans and ..., Volume 1, Part 1" By John Wilson, Thomas Maclauchlan, 1882.
"Each clan had a stated place of rendezvous, where they met at the call of their chief. "When an emergency arose for an immediate meeting from the incursions of a hostile clan, the cross or tarie, or fiery-cross, was immediately despatched through the territories of the clan. This signal consisted of two pieces of wood placed in the form of a cross. One of the ends of the horizontal piece was either burnt or burning, and a piece of linen or white cloth stained with blood was suspended from the other end. Two men, each with a cross in his hand, were despatched by the chief in different directions, who kept running with great speed, shouting the war-cry of the tribe, and naming the place of rendezvous, if different from the usual place of meeting. The cross was delivered from hand to hand, and as each fresh bearer ran at full speed, the clan assembled with great celerity. General Stewart says, that one of the latest instances of the fiery-cross being used, was in 1745 by Lord Breadalbane, when it went round Loch Tay, a distance of thirty-two miles, in three hours, to raise his people and prevent their joining the rebels, but with less effect than in 1715 when it went the same round, and when 500 men assembled in a few hours, under the command of the Laird of Glenlyon, to join the Earl of Mar.
Every clan had its own war-cry, (called in Scottish slogan,) to which every clansman answered. It served as a watch-word in cases of sudden alarm, in the confusion of combat, or in the darkness of the night."
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from..."The Analytical review, or History of literature, domestic and ..., Volume 27", By Thomas Christie, 1798.
"The Mackenzies have for their flughorn (or slogan, as it is pronounced in the southern counties of Scotland) Tulloch Aird, which is the place where the clan meets. This word or cry was pronounced every where by a person carrying a cross of wood burning at each end, or a fiery cross; by the sight of which, and by the flughorn or war cry, all the individuals of the clan were advertised to meet at a certain place. A hand carrying a fiery cross, is borne in the arms of some of our old families, as the Macleans"
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from...CELTIC MAGAZINE: DEVOTED TO THE LITERATURE, HISTORY, ANTIQUITIES,FOLK LORE, TRADITIONS,AND THE SOCIAL AND MATERIAL INTERESTS OF THE CELT AT HOME AND ABROAD. CONDUCTED BY ALEXANDER MACKENZIE, F.S.A. SCOT., 1883.
Slogans Or War-cries. In the event of any sudden surprise, each clan had its own war-cry; in most cases these were chosen from some particular circumstance or incident in the history of the clan, sometimes from some rallying point to which all were to hasten when the cry was raised. The raising of the slogan was sure to bring his clansmen to a Highlander's assistance if at all within hearing—
The Buchanans had " Clar-Innis" an island in Loch-Lomond.
Campbells—" Beinn Cruachau," or " 'S fluui an eigh gu Loch Ogha "—'Tis a far cry to Loch Ow.
Farquharsons—" Cam na Cuimhne "—The cairn of remembrance.
Frasers—" Mor-faigh "—Get more. Later, "Casteal Dhuinidh."—Cd.±l\e Downie.
Forbes—" Lonach "—A mountain in Strath Don.
Grant—" Creag Eileachaidh" —The rock of alarm in Strathspey. Another branch of the Grants called "Clann Chirin," have " Creag Rabhadh. "—The rock of warning.
Macdonald—" Fraoch Eilean "—The heathery isle.
Macdonald, Keppoch — "Via's Naomh Aiulra "—God and St Andrew.
Macdonald, Clan Ranald—" Aodann Othannaich."
Macdonell, Glengarry—" Creag an Fhithich"—The raven's rock.
Macfarlan—" Lock Sloigh "—The loch of the host.
Macgregor—" Ard-Choille"—The woody height.
Macintosh—" Loch na Maoidh"—Loch Moy.
Mackay —" Bratach bhan Chlann Aoidh "—The white banner of Mackay.
Mackenzie—" Tulloch Ard"—A mountain in Kintail.
Mackinnon—" Cuimhnich bas Ailpein "—Remember the death of Alpin.
Macpherson—" Creag dhubh Chimin Chalain"—A rock in Badenoch.
Menzies—" Geala's dearg a suas"—White and red above, from the checks of
their tartan.
Munro—" Caistial Fhulais na thcine "—Fowlis Castle on fire.
Stewart—" Creagan Sgairbh "—A rock in Appin.
Sutherland—" Ceann na drochaide luge "—A bridge at Dunrobin.
"Eigfte Co'raig" or " Gaoir Chatha" was the name given by ancient Highlanders to the shouts used when about to engage in battle. Any loud clamour is still compared to Gaoir Chatha. We have often heard the remarks " Cha Chluinnte Gaoir Chatha leibh" a war shout couldn't be heard for you—made to a person making a loud noise.
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David Upton