[2][3] Viking naval power was disrupted by conflicts between the Scandinavian kingdoms, but entered a period of resurgence in the thirteenth century when Norwegian kings began to build some of the largest ships seen in Northern European waters.
[4] In 1263 Hakon responded to Alexander III's designs on the Hebrides by personally leading a major fleet of forty vessels, including the Kristsúðin, to the islands, where they were swelled by local allies to as many as 200 ships.
[1] Defeat on land at the Battle of Largs and winter storms forced the Norwegian fleet to return home, leaving the Scottish crown as the major power in the region and leading to the ceding of the Western Isles to Alexander in 1266.
[6] English naval power was vital to Edward I's successful campaigns in Scotland from 1296, using largely merchant ships from England, Ireland and his allies in the Islands to transport and supply his armies.
This was largely focused on the west coast, with the Exchequer Rolls of 1326 recording the feudal duties of his vassals in that region to aid him with their vessels and crews.
In the late fourteenth century naval warfare with England was conducted largely by hired Scots, Flemish and French merchantmen and privateers.
[19] During the Bishop's Wars the king attempted to blockade Scotland and planned amphibious assaults from England on the East coast and from Ireland to the West.
[21] After the Covenanters allied with the English Parliament they established two patrol squadrons for the Atlantic and North Sea coasts, known collectively as the "Scotch Guard".
[23] Scottish seamen received protection against arbitrary impressment by English men of war, but a fixed quota of conscripts for the Royal Navy was levied from the sea-coast burghs during the second half of the seventeenth century.
In the Early Middle Ages war in Scotland was characterised by the use of small war-bands of household troops often engaging in raids and low level warfare.
[29] By the High Middle Ages, the kings of Scotland could command forces of tens of thousands of men for short periods as part of the "common army", mainly of poorly armoured spear and bowmen.
After the "Davidian Revolution" of the 12th century, which introduced elements of feudalism to Scotland, these forces were augmented by small numbers of mounted and heavily armoured knights.
In the Late Middle Ages under the Stewart kings forces were further augmented by specialist troops, particularly men-at-arms and archers, hired by bonds of manrent, similar to English indentures of the same period.
[35] The feudal heavy cavalry had begun to disappear from Scottish armies and the Scots fielded relatively large numbers of light horse, often drawn from the borders.
[15] A clan leader like John Grant of Freuchie in 1596 could muster from his kin, friends, and servants 500 men able to fight for King James and the Sheriff of Moray.
[37] In the early seventeenth century relatively large numbers of Scots took service in foreign armies involved in the Thirty Years' War.
[38] As armed conflict with Charles I in the Bishop's Wars became likely, hundreds of Scots mercenaries returned home from foreign service, including experienced leaders like Alexander and David Leslie and these veterans played an important role in training recruits.
[41] Royalist armies, like those led by James Graham, Marquis of Montrose (1643–44) and in Glencairn's rising (1653–54), were mainly composed of conventionally armed infantry with pike and shot.
[43] At the Restoration the Privy Council established a force of several infantry regiments and a few troops of horse and there were attempts to found a national militia on the English model.
[44] Pikemen became less important in the late seventeenth century and after the introduction of the socket bayonet disappeared altogether, while matchlock muskets were replaced by the more reliable flintlock.
[44] On the eve of the Glorious Revolution the standing army in Scotland was about 3,000 men in various regiments and another 268 veterans in the major garrison towns.
Prominent sailors of the era included: Field Marshal Sir Douglas Haig led the British Army on the Western Front from 1915, and oversaw some of the largest and bloodiest episodes of the war.
Battles included the Somme(1916) Ypres (1917) Cambrai (1917) Amiens (1918) and Arras (1918) Due to the kilts worn by the Scottish soldiers on the World War I battlefront, their German enemies called them the "ladies from hell".
One well-argued estimate put the figure at 110,000, equivalent to about 10 percent of the Scottish male population aged between sixteen and fifty, and probably to about 15 per cent of total British war dead — the sacrifice was higher in proportionate terms than for any other country in the Empire.
During World War II, Allied and British Commandos trained at Achnacarry in the Highlands and the island of Gruinard was used for an exercise in biological warfare.
[71] Prominent Training Areas include Garelochhead, Cape Wrath, Barry Buddon, The Army Selection and Development Center in Penicuik, and Castlelaw in the Pentland Hills.