was the first city involved in any world war?
Yes, the Second World war.
Hamburg
In Nazi Germany (1933–1945), Hamburg was a "Gau" from 1934 until 1945. During the Second World War, Hamburg suffered a series of Allied air raids which devastated much of the city and the harbour. 
the most famous oratorio in the world is messiah written by Composed by George Frideric Handel,with a scriptural text compiled by Charles Jennens. when was this composed? 1741. how many parts are there in this? Three. is there a different edition of it? Yes, there exists different editions like the ones by Friedrich Chrysander and Max Seiffert , Mozart, Goossens and Andrew Davis and others. who is the first musician mentioned here? A German music historian, critic and publisher. has he written any other piece of music? He edited the music of other composers like François Couperin le Grand. where was the original composer mentioned earlier born? Halle, Duchy of Magdeburg. what other songs has he composed? "Zadok the Priest" , "Solomon" and other works. what other cities has he lived in? Hamburg and London.
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Hamburg [SEP] Second World War
In Nazi Germany (1933–1945), Hamburg was a "Gau" from 1934 until 1945. During the Second World War, Hamburg suffered a series of Allied air raids which devastated much of the city and the harbour. On 23 July 1943, Royal Air Force (RAF) and United States Army Air Force (USAAF) firebombing created a firestorm which spread from the "Hauptbahnhof" (main railway station) and quickly moved south-east, completely destroying entire boroughs such as Hammerbrook, Billbrook and Hamm South. Thousands of people perished in these densely populated working class boroughs. The raids, codenamed Operation Gomorrah by the RAF, killed at least 42,600 civilians; the precise number is not known.