April 9th, 1940—Norway stands under siege as German warships steam toward Oslo. Colonel Birger Eriksen, commander of the undermanned Oscarsborg Fortress, faces an impossible moment with no reinforcements, no clear orders, and time slipping away. In a bold decision that alters history, he orders the launch of the first shots against the invasion, sinking the heavy cruiser Blücher in a stunning blow. This heroic stand stalls the enemy advance, buying precious hours before a full-scale occupation can take hold, and echoes through the ages as a symbol of defiance.

Yet victory comes at a steep cost. For ten grueling hours, Eriksen and his brave garrison endure relentless German bombardment, trapped on their island stronghold. With shells raining down and the fortress crumbling, he fights not only to shield his beleaguered nation but to safeguard the lives of his closest comrades and family. Amid the chaos of smoke, fire, and unyielding assault, Eriksen's resolve holds firm, embodying the unyielding Norwegian spirit against overwhelming odds.