They were chosen because, at that time, the commanders most experienced in siege warfare (including Boris Sheremetev, Jacob Bruce, and Anikita Repnin) were concentrated around Riga.
De valdes därför att de befälhavare som på den tiden var de mest erfarna i belägringskrigföring (inklusive Boris Sjeremetev, Jacob Bruce och Anikita Repnin) var stationerade kring Riga.