... LONDON, MONDAY, JUNE 20. THE Attwood steamer lias arrived from Rotterdam. The Captain report* that intelligence had reached there the death of the Russian General-in-( hief, Field Marshal Diebitscl). It was given out that he died of apoplexy, but the general belief was tliat he had destroyed himself; and this opinion appears to be countenanced by an article from Berlin, which states that the ...