The siege of Gana was a twenty-day siege by a German army led by King Henry the Fowler against a Slavic Glomacze fortification, that took place in early 929 at the fort of Gana, named so after the nearby Jahna river. In early 929, King Henry led a campaign along his realm's eastern frontier against a multitude of Slavic forts. After capturing his first target at Brandenburg, he seized several more Slavic forts in the area and constructed German ones to establish and secure German control over the territory. A powerful Glomacze fort at Gana near modern-day Stauchitz was Henry's second primary target of the campaign. Henry's army took the fort after expending at least 110,000 man-hours of labour filling in a section of the ditch that protected it. Upon conquest of the stronghold, the Glomacze garrison was exterminated on Henry's orders and the young boys and girls in the fort were enslaved to Henry's milites professional soldiers. The siege and the subsequent establishment of a German fort at Meissen guaranteed permanent German dominance along the middle Elbe river and led to the creation of the Marca Geronis to maintain the conquests. The siege at Gana, combined with the large number of sieges in the rest of Henry's 929 campaign, show the considerable resources that could be mobilized by the German kingdom for extended warfare to conquer, control and annex territory. Background In the winter of 928, King Henry the Fowler of Germany organized a military expedition along his eastern frontier against various Slavic fortifications. His first objective was the Hevelli tribe's princely seat Brandenburg, located along the Havel river. The Germans reduced Hevelli military power through a multitude of battles, before closing in on the Brandenburg fortress and capturing it by a storm. Upon occupation of the fort, Henry proceeded to take over all of Hevelli territory. The next German campaign target was the Glomacze fortress of Gana near the Jahna river. On their way to Gana, Henry's army marched along the Plane valley to the Fläming hills, conquering more Slavic forts at Belzig, Mörz, Niemegk and Zahna. Nearby, German forts were constructed in 929 at Strehla, controlling a ford over the Elbe, at Osterburg and at Dahlen, securing the area. Siege Archaeological excavations have uncovered a fortress in the Jahna river valley near Stauchitz that may be identified with the Gana site. The fort had walls 15 meters