Final answer:
The Germans reached the River Goksu in early May 1190 during the Third Crusade, led by Emperor Frederick Barbarossa.
Step-by-step explanation:
The question refers to a historical event involving the Germans during their Third Crusade. The Germans, led by Emperor Frederick Barbarossa, resumed their journey from Konya and reached the River Goksu. The date of their arrival at the River Goksu was early May 1190. This journey was part of the larger context of the Third Crusade, one of the major military campaigns undertaken by European Christian states to regain the Holy Lands from Muslim control.
It's important to note the information provided about the Soviets, British, French, and US forces meeting at the River Elbe on April 25th appears to be about World War II, and not related to the Third Crusade. It's crucial to keep the historical contexts distinct when studying these events.