US troops and German POWs as VO Harry Truman reads statement of German World War II surrender

In 1945, President Harry S Truman announced Germany's surrender, marking a significant victory for the United Nations. He expressed a wish that Franklin D. Roosevelt had lived to witness this moment. General Eisenhower reported the surrender, and flags of freedom were raised across Europe. Truman offered thanks to Providence for guiding them through adversity to victory.

Who informed Truman about the surrender of Germany?

What did Truman express gratitude for in his announcement?