Halliday inspired Aberdeen (now playing in red shirts) to their first senior silverware in 1946, winning the Scottish League Cup (although this was a reduced wartime version of the competition known officially as the Southern League Cup), and taking his team back to Hampden the following season in the same competition, although they were defeated on this occasion. Aberdeen also reached the Scottish Cup final in that same season, 1946–47, and this time the Cup was won, Hibernian being the defeated finalists.