The army was joined in 1628 by nine thousand Scots and English soldiers, and from this period the British troops took an important part in the military operations of the Swedish monarch, who was now at the head of 2,000 cavalry, 24,000 infantry, and 3,000 archers. He repulsed the Poles in a sharp skirmish, and captured four field-pieces and fourteen colours; and he subsequently besieged _Dantzic_, but he afterwards relinquished his design on this place, and captured, by surrender, _Newburg_, _Strasberg_, and _Dribentz_, and took _Sweitz_ and _Massovia_ by storm. This year _Stralsund_ was besieged by the Imperialists, and two Scots regiments in the service of the King of Denmark, with a detachment from the King of Sweden's army, under the Scots Colonel, Sir Alexander Lesley, assisted in the defence of the town; after a siege of three months, the Emperor's General, Albert Count Walstein, having half-ruined a numerous army, retired from before the place. [Sidenote: 1629] In the succeeding year the Emperor Ferdinand II. commenced measures for the extirpation of the protestant religion in Germany, where it had taken deep root for about a century; he also sent troops to the assistance of the Poles in their war with Sweden; but Gustavus was enabled to oppose the united armies, and to hold them in check. In a partial action between the advance-guards, a few miles from _Thorn_, Gustavus's hat was knocked off in a personal encounter with one of the enemy's officers named Sirot, who afterwards wore the hat without knowing to whom it belonged. On the succeeding day, two prisoners (one a Scots officer named Hume) seeing Sirot wearing the King, their master's, hat, wept exceedingly, and with exclamations of sorrow, desired to be informed if the King was dead. Sirot, being thus made acquainted with the quality of his antagonist in the preceding day's skirmish, related the manner in which he became possessed of the hat, upon which they recovered a little from their anxiety and surprise. Soon afterwards the King of Poland, having nearly exhausted his resources, became disposed to enter into pacific relations with Sweden, and a treaty was concluded in the summer of this year. This peace gave the King of Sweden an opportunity of executing his design of interposing in behalf of the persecuted protestants of Germany, in which he was abetted by England, France, and Holland, and the Scots in his service had the honour of taking part in this glorious enterprise. [Sidenote: 1630]