From an British Empire perspective the action took place in the Middle East and the command base camp etc was based in Egypt. However as Tommiks points out the Caucasus Campaign did not take place in the Middle East nor geographically did the fighting in the Dardanelles Campaign.
Most English language speakers are searching on the web for the conflict they are likely to look under "Middle East" not "Ottoman". The trouble with the term "Ottoman Theatre" or ("Ottoman Theater") is that AFAICT it is a neologism see Wikipedia:Avoid neologisms. Searching Google only throws up one page which looks like a translation. The term "Middle East Theatre" is not see for example the link in the further reading section: The Middle East during World War OneBy Professor David R Woodward. Philip Baird Shearer 12:36, 5 February 2006 (UTC)
I will try to answer the question about why people from the (British) Commonwealth will perceive all three campaigns as in the Middle East theatre. Now we (who are discussing this) all know that the Dardanelles are not in the Middle East, but the men fighting on the Allied side were in Egypt before embarking for the Dardanelles (or Palatine) so the perception rightly or wrongly is that the Dardanelles is a Middle East campaign. This is the viw that most people who know anything about the campaign still have. The term does not have to be a correct to be used. As for the fourth campaign, as far as the English reading world is concerned, it did not exist unless the person has a very detailed knowledge of WWI history.We could strip that campaign out of this article but I see no advantage to that as it does introduce English speaking people to the concept that the war against Turkey was more than a British Empire effort and that the Turkish high command had more to worry about than attacks by just the British. --Philip Baird Shearer 03:06, 6 February 2006 (UTC)
Personally I think that the information should be by campaign not chronologically, although the paragraphs/subsections of each campaign section can/ought to be arranged chronologically . user:OttomanReference, by the edits (s)he has made clearly thinks that the theatre should be organised chronologically.
My major objection to this is that the campaigns were not clearly linked and it destroys the ability to place "Main article" links in each of the sections. I am not against having a timeline section in this article but I do not think that the all of article should be arranged chronologically What do others think? --Philip Baird Shearer 23:30, 26 October 2006 (UTC)