Short answers, pulled from the story.
The German 11th Army and Romanian Third Army began their assault on the 26th of September 1941. This offensive marked the start of a brutal campaign across the Crimean Peninsula.
By the 18th of May, all Soviet troops on the peninsula had been eliminated by Axis forces. The destruction of this Soviet force removed a critical distraction from the main siege.
Romanian submarine Delfinul operated under the command of Constantin Costăchescu during late October 1941. In the early hours of the 6th of November, the vessel torpedoed and sank the Soviet cargo ship Uralets south of Yalta.
The 4th Ukrainian Front led the successful operation to recapture the entire peninsula. The Crimean offensive launched on the 8th of April 1944 and concluded on the 12th of May 1944.
German occupation policies remained in effect until the Soviet liberation offensive began in 1944. Only Kerch had been briefly recaptured by Soviets before being retaken again during Operation Bustard Hunt on the 8th of May.