Hepburn was joined by Colonel Mostyn, an Englishman, and Count Brahe, with 200 German arquebusiers, and this force for two days withstood the incessant attacks of the whole of the Polish army.
"While this desperate strife was going on, and the attention of the enemy entirely occupied, Gustavus managed to pass a strong force of men and a store of ammunition into the town, and the Poles, seeing that he had achieved his purpose, retired unmolested.

In every battle which Gustavus fought Hepburn bore a prominent part.

He distinguished himself at the storming of Kesmark and the defeat of the Poles who were marching to its relief.
"He took part in the siege and capture of Marienburg and in the defeat of the Poles at Dirschau.

He was with Leslie when last year he defended Stralsund against Wallenstein, and inflicted upon the haughty general the first reverse he had ever met with.

Truly Hepburn has won his honours by the edge of the sword." "Wallenstein is the greatest of the Imperial commanders, is he not ?" Farquhar asked.
"He and Tilly," Munro replied.