Disaster Commander! Our Chronosphere Research Centre in Leich has just been captured by the Soviets. If they leave the area with our research data, they could create their own Chronosphere against us. This cannot be allowed to happen. You must act quickly. Recapture the Chronosphere and destroy all Soviet forces in the area. Do not let any Red leave alive.
Download the zip file, extract and place all 3 files into the your custom maps Red Alert file. (Documents -> CnCRemastered -> Local_Custom_Maps -> Red Alert) Boot up the game, go to Missions -> Custom Missions and the mission name should be there.