First Tiberium War
In the early middle of the war, Nod crossed into Berlin and crushed all of their forces across Germany causing GDI to lose a country that was one of their own members in the First Tiberium War. Bierman contacted Solomon and M.O. Morelli to defeat the Nod forces at once in a city called Dresden and either Solomon or another GDI commander was sent to Hanover. That commander repaired the GDI base hit by Nod forces and striked their major base of operations in the city, killing the Nod Commander in charge of Dresden. With reinforcements arriving after the GDI victory, Helmut Bierman arrived home and restored his old government to power.