The exploits of these Scottish levies have been recorded in a curious but confused narrative, the production of one of the officers, and now a great rarity, entitled _Monro his Expedition, with the worthy Scots Regiment called M‘Kay’s Regiment_, &c.[7] The author, Colonel Robert Monro, states that he composed it at his spare hours, ‘for the use of all worthy cavaliers favouring the laudable profession of arms.’ He gives a long list of officers, all bearing familiar Scottish names--as Forbes, Monro, M‘Kay, Sinclair, Ross, Gordon, Stewart, Innes, Seton, Dunbar, Hay, and Gunn. In the ranks were included a small band of Macgregors, who had been lying for some time in the Tolbooth of Edinburgh, on account of their irregularities, and who are said to have proved good soldiers under regular discipline and with a legitimate outlet for their inherent turbulence and courage. One portion of the Scots Regiment was sent to join the English auxiliaries under General Morgan. Another was put to a severe duty in defending the Pass of Oldenburg against Tilly’s army. The latter are described as shewing a remarkable degree of firmness and gallantry in that trying situation, from which they had to retire, after a loss of four hundred men. Another party, of four companies, under Major Dunbar, defended the Castle of Brandenburg in Holstein against 10,000 men under Tilly, with such desperate and sanguinary pertinacity, that, on the place being ultimately taken, they were all put to the sword. On many other occasions, these valiant Scotsmen distinguished themselves greatly, insomuch that they came to be called the Invincible Regiment. It was greatly owing to them that Stralsund made such an obstinate defence against Wallenstein. Here they lost 500 men in seven weeks, only about 400 being now left. When the Danish king was forced to evacuate Pomerania, the Scots defended the bridge at Wolgast, till he was safe. So early as January 1628, Sir Donald M‘Kay had to go home for fresh levies. He returned in July with as many as raised the corps to 1400 effective men. But before any further remarkable service had been performed by the regiment, the King of Denmark was glad to make peace. [Sidenote: 1626.]