By 1627 his reputation was such that he became one of four Scottish colonels knighted that year by Gustav II Adolf, the others being Patrick Ruthven, Alexander Leslie and David Drummond. In June 1630 Hepburn accompanied the Swedish king to Pomerania when the king initiated his German campaigns against the Habsburg Empire. Hepburn jointly commanded with Colonel Maximillian Teuffel at Colberg, which capitulated to Swedish forces in 1630.
By 1627, Hepburn's reputation was so great that he was among four Scottish colonels knighted by Gustav II Adolf in the same year. The others were Patrick Ruthven, Alexander Leslie, and David Drummond. In June 1630, Hepburn accompanied the Swedish king to Pomerania during his German campaigns against the Habsburg Empire. He commanded with Colonel Maximillian Teuffel at Colberg, which fell to Swedish forces in 1630.