Which team, known along with Linfield as one of Belfast's "Big Two," did Walter McMillen play for?
Glentoran F.C.: Glentoran Football Club is a semi-professional football club that plays in the NIFL Premiership. Glentoran F.C.:  Linfield and Glentoran are nicknamed Belfast's "Big Two", as they have traditionally dominated local football in Northern Ireland since the demise of Belfast Celtic.
i don't know