Following their defeat in Britain, the Chimera turned Gerolstein into a massive construction zone where they built a series of airships. During Operation Overstrike on September 2nd, 1951, James Grayson arrived in Gerolstein where he aided Stephen Cartwright in destroying Chimeran Earth Movers from reaching the Maquis' base in Luxembourg. After the final battle of Operation Overstrike on September 6th, the Chimera abandoned Gerolstein and moved their construction operations elsewhere.