Battle of Inverlochy ( 1645 ) The Battle of Inverlochy ( 2 February 1645 ) was a battle of the Scottish Civil War in which Montrose routed the pursuing forces of the Marquess of Argyll . The battlefield is currently under research to be inventoried and protected by Historic Scotland under the Scottish Historical Environment Policy of 2009 . On 14 January 1645 , having sacked Inverary , the seat of the Campbells of Argyll , the Royalist forces left Inverary and headed north . It is believed that Montrose split his army at Glen Etive sending part of it up past Ballachulish while the bulk continued across Rannoch Moor , into Glencoe . At Glencoe the army crossed the high passes into Glen Nevis , moved around the north slopes of Ben Nevis , circumventing Inverlochy Castle , and then continued up the Great Glen , arriving at Kilcummin to re - supply . Montroses ' army was dwindling as his highlanders continued to head home leaving him with about 1500 men . He was aware that a Covenanter army under the command of the Earl of Seaforth was waiting to confront him Inverness . Montrose was also aware that Argyll , with a force of 3000 men , was pursuing him and was only thirty miles behind at Inverlochy . What followed was one of the greatest flanking marches in British history across some of the toughest and wildest terrain in the British Isles . Instead of marching back down the glen , Montrose decided to surprise Argyll and marched south through the mountains around Ben Nevis to mount a surprise attack . The Montrose army spent a cold night in the open on the side of Ben Nevis . Argyll was aware that a small force was operating in the area , he did not know however that it was the entire royal army . Just before dawn on 2 February 1645 , Argyll and his covenanters were dismayed at the sight that lay before them , as far as they were aware Montrose should have been 30 miles north . Argyll did not stay for the battle , but instead he left the command of his army to his General , Duncan Campbell of Auchinbreck and retired to his galley that was anchored on Loch Linnhe . Auchinbreck lined up the covenanters in front of Inverlochy castle , which he reinforced with 200 musketeers to protect his left flank . In the centre he placed the Campbells of Argyll and put the lowland militias on the flanks . Unlike at Tippermuir and Aberdeen , where Montrose had annihilated hastily conscript ed and poorly trained militia s , the troops he faced at Inverlochy were veterans of the war in England . Montrose lined his army up in only two lines deep to avoid being out flanked , placing his 600 highlanders in the centre with the Irish on the flanks , the right being commanded by MacColla . The fight did not start straight away and instead skirmishes broke out along the line . This is probably due to the fact that Auchinbreck and his officers believed that they were only fighting one of Montrose ' s lieutenants and not the man himself , believing he was still far up the glen . Just before first light , the Royalists launched their attack . The Irish clashed violently with the lowlanders on both flanks and routed them while the highlanders closed with the Campbells in the centre . The Campbells broke , but their retreat to the castle was blocked by the Royalist reserve cavalry under the command of Sir Thomas Ogilvie . Auchinbreck was shot in the thigh while trying to rally his men and died shortly afterwards . The remaining Covenanters briefly rallied around their standard , then broke and ran , trying to reach Lochaber . The small garrison in Inverlochy castle surrendered without a fight . Over 1500 Covenanter troops died , while Montrose is reputed to have only lost 250 men , the most notable being Sir Thomas Ogilvie who was killed by a stray bullet . Montrose , through his lieutenant , MacColla ( who commanded the 2000 Irish troops sent by the Irish Confederates ) , was able to use this conflict to rally Clan Donald against Clan Campbell . In many respects , the Battle of Inverlochy was as much part of the clan war between these two deadly enemies and their allies as it was part of the Wars of the Three Kingdoms , and that is how it was portrayed in Gaelic folklore .