Perhaps I can provide a little resolutionto your question.
The liberation of occupied Czechoslovakia was started in October-1944, by the Fourth Ukrainian Front, under General Petrov. He invaded eastern Slovakia, joined by Marshall Malinovsky's Second Ukranian Front, which had just liberated Hungary.
Having met little resistance by the Germans, the Russians overan most of Moravia in the first day or so of May-1945.
They were facing the only German army left in Europe, Field Marshall Schorner's Army Group Center.
The US Third Army, under General Geo. Patton, also advanced into Czechosloviakia. This was the 90th Infantry Division, which entered the country at Prex 15 April 45, and was advancing on the capitol, Prague, when hostitilties ended on 7 May 1945.
On 11 May 1945, Marshall Schorer surrendered. (That was four days after the US recognized Victory in Europe Day).
Uniquely, this was the last military offensive in World War II in Europe.
I also identify the 97th Infantry Division (V Corps,US Third Army) as engaged at Pilsen, Cz on 6 May 45. The 97th ID reached Konstantinovy Lazne, Cz, 7 May 45.
At the same time, the XII Corps was reported as advancing on Prague.
So there are three possibilities for you, including Pilsen, Kon. Lazne or Prague as possibly having been the site of Harold's demise.
I hope that some part of the above will help you in your quest.