 On 4 May, the 3rd Army's V Corps and XII Corps advanced into Czechoslovakia, and units of the VI Corps met elements of Lieutenant General Lucian Truscott's U.S. 5th Army on the Italian frontier, linking the European and Mediterranean Theaters.Also on 4 May, after a shift in inter-army boundaries that placed Salzburg in the 7th Army sector, that city surrendered to elements of the XV Corps.The XV Corps also captured "Berchtesgaden", the town that would have been Hitler's command post in the National Redoubt.