The Battle of Rotterdam was a defensive operation by the Chimera that had completely took the Anglo-Maquis Coalition by surprise and almost scuppered the Human Operation Overstrike, an offensive to liberate Western Europe, before it had even begun.
After the success of the Anglo-American Operation Morning Star which had liberated Britain from the Chimera. Maquis officials contacted the British to ask whether the latter could help free Western Europe from the same species. The British Intelligence Corps, under the command of Colonel Rachel Parker, agreed to send two squadrons to the Maquis headquarters in Luxembourg to help with their fight. With Chimeran sea defences littering the coasts of France, Belgium and the Netherlands it was near impossible to enter Europe from the Atlantic Ocean. A few weeks before the planned start of Overstrike (August 30th), Maquis intelligence officers discovered and announced that Rotterdam was a safe corridor for the two squadrons to fly through.
On August 30th, 1951. Two squadrons based at Dover, Kent, England decided to depart. First Squadron, headed by Major Stephen Cartwright of the Royal Marines, but also containing Maquis Colonel Roland Mallery, Raine Bouchard and Private James Grayson,took off first, with Second Squadron, lead by Colonel Rachel Parker of the Intelligence Corps heading off four hours later.
Within the route to Rotterdam, the Chimera launched an ambush attack on First Squadron with their Gun Towers, shooting down several VTOLs. Most of the surviving soldiers bailed out alive and were scattered in the ruined city. Meanwhile, Cartwright ordered Parker to turn her Second Squadron back to Dover. Grayson and Bouchard jumped out of their VTOL and landed in a destroyed building. They fought their way to the rally point and eventually regrouped with Mallery at the rally point.